This document discusses different types of graphic files and their formats and extensions. It explains that raster files are made up of pixels and can be edited in programs like Photoshop, while vector files use mathematical expressions and lines/curves to represent smooth images that can be resized without distortion. Metafiles can contain both raster and vector graphics. Common file extensions are .jpeg and .png for raster, .eps for vector, and .wmf for metafiles. The author provides examples of how they used different file types and extensions to create graphics for a magazine cover.