GIF or .gif (Graphics interchange format):
An 8-bit low memory option for posting images online. GIF images are limited to 256 colours making them unsuitable for most print applications. However their limited colour quality makes them ideally suited for the limited colour display range of computer monitors.
JPEG or .jpg:
File format designated by the Joint photographic experts group for image compression. Because it is a lossy compression format image quality is sacrificed to conserve disk space. JPEGS are frequently used for placing imagery in websites and online applications where high resolution files aren't necessary.
PDF. or .pdf (Portable document format):
Used for allowing documents to be viewed and printed independent of the application used to create them. Often used for transferring printed pages over the web. Either for downloading existing publications or for sending documents to commercial printers for output.
TIFF. or .tiff (Tagged image file format):
Used for placing images or graphics in documents created in word processing, page layout, or drawing programs. Supports rasterized data and converts vectored images to bits. TIFF files can be cropped or edited.
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