Answer
Raster-based art files are design files that are broken up into small colored dots called pixels. Each of these tiny pixels put together creates an image. The quality of the design file depends on 1) the size of the design that was created, and 2) the resolution or dpi of the file—this will be the total number of pixels. The higher the pixel count, the higher the quality of file (which increases file size). Some examples are raster-based file extensions are .JPG, .TIF, .PNG, .PSD, etc.