This document provides definitions and information about common file types including their file extensions and intended uses. It discusses bitmap (.bmp), EPS, GIF, JPEG, PSD, PNG, TIFF, Illustrator (.ai), and PDF file types. For each file type, it describes whether it contains raster or vector data, its color support, compression methods, and whether it is best suited for web, print, or other uses. The document is intended as a resource to help understand which file format to use for different programs and purposes.