This document provides an overview of image compression techniques. It discusses how image compression works to reduce the number of bits needed to represent image data. The main goals of image compression are to reduce irrelevant and redundant image information to produce smaller and more efficient file sizes for storage and transmission. The document outlines different compression methods including lossless compression, which compresses data without any loss, and lossy compression, which allows for some loss of information in exchange for higher compression ratios. Specific techniques like run length encoding are also explained.