There are two main types of compression, lossy and lossless. File compression usually happens so that you can make more space available on your hard disk, by shortening the file sizes.
Lossy file compression results in lost data and quality from the original version. Once the file has been compressed it is virtually impossible to return the image to its former quality, once re-opened after compression. Lossy compression is commonly used to compress file and images (audio, video and still images). Lossy files are normally a smaller file size
Lossless Compression
Lossless data compression is a form of compression that allows you to reconstruct the original file or image to its original quality. No quality will be lost each time you open the compressed file. Lossless data is used in applications like WinZip.
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