Data Compression

We have all downloaded files from the internet.You must have noticed that almost always, they are in .rar or .zip format i.e. they are compressed. Compression allows us to reduce the size of a file by up to 75%. Now,the question that arises is, HOW IS IT DONE? Let me explain. There are 2 types of compression : 1. Lossless Compresssion : In lossless compression ,as the nae suggests,there is no loss i.e. the data is fully recovered on decompression. Eg. winRAR files ,WinZip files . 2. Lossy Compresion : In lossy compression ,there is a loss in the data while compression i.e.