Objects : Objects are the real world entities. People, companies, employees, fan and ledger entries are all types of objects. In object-oriented terms, the word object is used to describe one specific thing like a car. Objects have an identity and this identity is defined with properties. A car has its name, model, cost and color.
Objects also do things. E.g. the car accelerates, races etc. The things an object can do are called its behaviours.
Objects can be anything that exists in real world. They can be conceptual things, such as engineering process or payroll. These conceptual things are not tangible but are conceptual. The same object-oriented concepts apply regardless of whether the object is based on the real world, on a concept, or on the implementation.
Modules: Modules are collection of code and data that function something like objects in objects oriented programming, but without defining OOP characteristics like inheritance, polymorphism etc. The concept behind modules is to enclose procedures and data in a way that hides them from the rest of the program.
The two main types of procedures used in VB :
Event and General : In VB event procedures are invoked in response to keyboard, mouse or system action. Your code can also explicitly invoke event procedures. The maximum number of events a control can have is fixed. Event procedures are stored in a form module and are private by default. A general procedure is not executed unless explicitly invoked. You can create a general procedure either by choosing the procedure from the insert menu or by typing the procedure heading Sub followed by the procedure name on a blank line.
Event and general procedures are further classified as : Sub & Function.