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File Compression (Graphic Compression (Bitmap (RLE, LZW), GIF (LZW), PNG…

- - - - Used in situations where there is a simple pattern to the file, meaning each section can have, say, the colour required and then how many times it's repeated written into the code
    - - Used in situations where there is little repetition and so coding each instance would be pointless. Instead it decides on sections that look similar and will replace one with code for the other, causing small differences from the original