CGM stands for computer graphics metafile, which is an international standard file format for graphic images. Most CGM files are vector graphics, although it is possible to store raster graphics in the CGM format. The purpose of creating a standard is to enable users of different systems and different programs to exchange the same graphic file. It is extremely difficult, though, to create a standard so strict that it can work seamlessly everywhere. A CGM file created in one program may not necessarily be read by every other program.
The Windows metafile format (WPM) developed by Microsoft Corporation may eventually supplant CGM as the vector graphics standard.
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