Relation Algebra is a procedural query language for RDBMS (Relational Database Management System). An Algebra based on the set of operators (like Arithmetic operator, union, intersection relational operator, etc.) and operand. Edgar F. Codd created it for a relational database. Relational Algebra provides a fundamental query for retrieving data from databases. The retrieved result from algebra expression is a relation which formed from one or more relations. Relational Algebra specifies many operations to manipulate relations. [Read more…] about Relational Algebra – What is Relational Algebra?
What is relational database? – Definition
The database is the location to store the data. Firstly we used excel sheet to store the data. However, it has some problem with data integrity and redundancy problem. This problem solved by E.F. Codd proposed a model in 1970. This model was straightforward. It used the concept of mathematical relation which looks like a table. [Read more…] about What is relational database? – Definition
What is EEPROM? – Definition
Definition: EEPROM (pronounce as “E-E-PROM”) stands for Electrically Erasable Programmable Read-Only Memory. It is a non-volatile ROM chip which used for storing a small amount of data in computers or some other electronic devices. Through EEPROM, an individual byte of data can erase and reprogrammed entirety, not selectively by the electrical voltage. [Read more…] about What is EEPROM? – Definition
What is Kernel (Operating System)? – Definition
Definition: The operating system provides us a graphic interface to give the command to the computer system. But system can’t understand these commands directly. Translation of code into binary language done by the core component of an operating system (OS), i.e., KERNEL. User deal with the lowest layer of kernel and then kernel deal with system. [Read more…] about What is Kernel (Operating System)? – Definition
What is Grid Computing – Definition
Grid computing is a group of computers physically connected (over a network or with Internet) to perform a dedicated tasks together, such as analyzing e-commerce data and solve a complex problem. Grids are a form of “super virtual computer” that solve a particular application.The grid size may vary from small to large enterprises network. [Read more…] about What is Grid Computing – Definition
Who and When invented the first computer?
“Who invented the first computer?” is not an answer to be replied in one word or name and you are sorted, the answer is not depends on single machine, computer is made up collection of different parts, each part is a separate invention and it’s separate inventor. So the answer depends on different classification of computers. [Read more…] about Who and When invented the first computer?
Advantages And Disadvantages Of Computer
Computer has making human life faster because of its incredible speed,Accuracy and storage, with which human can save anything and search it out easily when needed. We can say computer a versatile machine because it is very flexible in performing their jobs. but Computers have several important advantages and disadvantages. [Read more…] about Advantages And Disadvantages Of Computer
What is Software | Type of Software | Definition of Software
What is Software: Computer software, or only software, is a kind of program that enable a user to perform some specific task or used to operate a computer. It directs all the peripheral devices on the computer system – what to do and how to perform a task. PC Software plays the role of mediator between the user and computer hardware. Without software, a user can’t perform any task on a digital computer.
A computer system can be divided into three components: the hardware, the software, and the users. Software can be further divide into mainly two parts: Application software and System Software. Bare use of hardware is not easy, so to make it easy, software created. [Read more…] about What is Software | Type of Software | Definition of Software
Definition of Computer | Meaning of computer
In 1640s, Computer term was first used as “one who calculates.” From 1897, term changed and got a new computer meaning “Calculating machine“. From 1945 the term indicates as “programmable digital electronic computer“. [Read more…] about Definition of Computer | Meaning of computer
List some of the important features of Mice & Keyboards
The mouse and keyboard are your PC’s eyes and ears; without them you could not execute commands or input text. In this article we’ll highlight some of their important features. [Read more…] about List some of the important features of Mice & Keyboards
Which two of the most important touch-based input technologies used
In terms of computing’s history, we’re just beginning to scratch the surface of the lifestyle applications of touch-sensitive gadgets. In this article, we’ll take a look at two of the most important touch-based input technologies used in computers, smartphones, laptops, and tablets. [Read more…] about Which two of the most important touch-based input technologies used
32-Bit vs. 64-Bit: What’s the Difference?
You’ve probably heard in computing industry, when you download a piece of software, the term 32-bit and 64-bit. Definition of term is that, it is used for processor, Operating System, install a game, computer driver etc.so we help you understand what the difference need to know about 32-bit vs. 64-bit architecture. [Read more…] about 32-Bit vs. 64-Bit: What’s the Difference?
How To Install An SSD
Moving from a hard drive to an SSD is a fairly straightforward procedure that you can perform in less than an hour. Here, we’ll cover the steps you’ll need to take in order to install an SSD in a desktop PC. [Read more…] about How To Install An SSD
What is eSATA?
eSATA. The external SATA interface has been around longer than most of the ports we just described. Until USB 3.0 came along, this port was the fastest link to consumer storage peripherals such as external hard drives. [Read more…] about What is eSATA?
What is HDMI (High-Definition Multimedia Interface)?
HDMI. The High-Definition Multimedia Interface has been around since the early 2000s, and was developed for consumer electronics devices such as Blu-ray Disc players and HDTVs. However, HDMI has also seen wide use in graphics cards and computer displays. Its connector’s wide rectangle with two beveled corners can be adapted to DVI. [Read more…] about What is HDMI (High-Definition Multimedia Interface)?
What is Thunderbolt?
Thunderbolt. The Thunderbolt standard (formerly called Light Peak) is aimed at being able to use a single interface for multiple device connections. Thunderbolt is a 10Gbps (1.25GBps) interface that combines PCI-E (Peripheral Component Interconnect Express) with Display Port in a single, thin cable. It can daisy-chain compatible devices, and it supports hubs, which lets you use a single cable connection to link your computer to a mouse, keyboard, monitor, and external storage drive. Even data from an external RAID (redundant array of independent drives) array of SSDs wouldn’t hit a bottleneck on its way to your computer, thanks to Thunderbolt. [Read more…] about What is Thunderbolt?
What is DisplayPort?
Display Port is a super-fast, 21.6Gbps interface designed to carry video to computer monitors. With this much bandwidth on tap, it’s able to accommodate greater resolution, faster refresh rates, and more color depth than HDMI (High-Definition Multimedia Interface). Besides professional media content generation applications, Display Port (sometimes abbreviated DP) is ideal for multiple-monitor setups. [Read more…] about What is DisplayPort?
How To Install An HDD or SSD
Whether you’re looking to replace a failed drive or upgrading to get more capacity and faster access times, installing a hard drive is simple. Just follow these steps to insert, secure, and power a new HDD in your desktop PC. [Read more…] about How To Install An HDD or SSD
Types of Storage Device | Types of Backup
There are three types of storage that we can use for our files:HDDs, SSDs, and cloud-based storage.
In some cases, we have the option of foregoing one type in favor of another when looking for more capacity, faster load times, or dynamically shifting capacities. Read on to determine which applications are best suited to which storage types. [Read more…] about Types of Storage Device | Types of Backup
External structure of an operating system
Kernel and utilities
The operating system includes a number of routines (subroutines). the most important are the core or kernel. It is loaded into memory live at system initialization and contains many procedures needed to ensure system operation. Other routines, less critical, are called utilities. [Read more…] about External structure of an operating system
Characteristics of an Operating System
Multitasking Systems
Most modern operating systems allow running multiple tasks both: a computer can, while executing a user program, read the data from a disk or display results on a terminal or printer. We talk about multi-tasking operating system or multi-programmed in this case. [Read more…] about Characteristics of an Operating System
The three main functions of an operating system
An operating system basically performs three independent tasks: it allows load after each other programs, it emulates a virtual machine and manages resources. Specify each task. [Read more…] about The three main functions of an operating system
What is Video Card?
The video card, as its name indicates is the component the computer whose role is to transmit data on the screen in the control of a microprocessor dedicated and integrated into the card. It is this microprocessor that calculates the position of points on the screen and processes the texture of restitution algorithms for display complex images such as those generated by video games. [Read more…] about What is Video Card?
What is Browsers?
A Browser is a piece of software that everybody needs if they want to surf the Internet for useful or interesting websites. Web pages are designed to be read by Browsers and Browsers are designed to read web pages. Fortunately, acquiring a Browser is slightly easier than catching the common cold. They are everywhere. Most computers now come with one pre-installed. A great many CD-ROMs are now designed to be read like a website and so include a Browser which can be installed onto a computer’s hard drive and ISPs give them away free to anyone who signs up for their service. There is nothing difficult about acquiring a Browser. [Read more…] about What is Browsers?
What is Plug-Ins?
Essentially these are extra programs that can be installed and used as part of a Browser i.e. they plug into it. Typically these would provide extra facilities like the ability to handle sound files or advanced graphics. What this means in practice is that, should a web page incorporate sound as well as text, the relevant plug-in will be needed before it can be read by any Browser and the sound played through the computer’s own speakers. [Read more…] about What is Plug-Ins?
What is Cookies?
In American homes, or so the story goes, when visitors arrive they are given a cookie which in Britain would be a biscuit. This philosophy has now been extended to the Internet. Whenever a visitor, better known as a Browser, arrives at certain sites a cookie is sent down the line and saves itself to the local computer’s hard disk. [Read more…] about What is Cookies?
What is Search Engines?
As all search engines are different they all operate in slightly different ways. The good news is that the same search techniques can be applied to them all, but, as might be expected, each one is a variation around the same theme. To make it even worse not all search engines actually search the Internet, some are what is known as web directories. Then, just to confuse the picture even more some engines do keyword searches while others are concept based. [Read more…] about What is Search Engines?
What is Error Code 404?
Of all these error codes by far the most common is 404 which is also one of the few that can be worked around – always assuming the website has not simply ceased to exist. Everything else can be fixed although it would help to explain the difference between web names as they appear in the press and as they appear in a Browser. [Read more…] about What is Error Code 404?
What is USENET?
Derived from Users Network this is, again, totally separate from the WWW. Briefly, the Internet is also home to what are called news groups which are broadly divided into several categories and which cater for every topic imaginable. [Read more…] about What is USENET?
What is Cloud Computing?
Cloud Computing Definition is that it is a shared pool of configurable computing resource (eg. networks, servers, storage, applications, and services) network on demand over the internet. Cloud computing literally, is the use of remote servers (usually accessible via the Internet) to process or store information. Access is usually using a Web browser. Save files on a server via the Internet is one example. [Read more…] about What is Cloud Computing?