Jpeg- A format for compressing image files, most common image format.
Raw- A file that contains minimally processed data from the image sensor of either a digital camera, image scanner, or motion picture film scanner.Allows for more editing to a picture but is a very large sized document.
Psd- PhotoShop Document , Photoshop's native, layered file format, which is a de facto standard in the graphics arts industry for bitmapped images.
Png-Portable Network Graphics, an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Most commonly used in website graphics or images.
Pdf- A file format that provides an electronic image of text and graphics that looks like a printed document and can be viewed, printed, and electronically transmitted.