All of us who use computers have used data compression, whether doing it ourselves or using a compressed file. Sometimes the compressed data or files are apparent while sometimes do not seem that way. For example, when you see a zip folder, you know there is data compressed in it. But when you see an image or a video, you don’t even notice or care to notice that those images and videos are compressed at all. That is the gist of compression – it shouldn’t seem like it has been compressed. JPEG is an extremely popular type of image compression technique and so are PNG, MP3, MP4 or MKVs.