A vector file is an image that can be made infinitely large without losing quality, and usually comes as an .ai, .eps, .pdf, or .svg file. Vector files are built by mathematical formulas that establish points on a grid, which makes them more versatile for certain types of tasks than raster files. The most common types of vector files are Adobe Illustrator (.ai), Encapsulated PostScript (.eps), Portable Document Format (.pdf), and Scalable Vector Graphics (.svg) . Vector files are useful for creating graphics that frequently require resizing, such as digital illustrations and company logos. They are also editable in different applications, such as Adobe Illustrator, and can be easily converted to .pdf. When saving a vector file, it is important to consider the best file extension for particular situations.