Compression is the reduction in size of data by converting it to a format that requires fewer bits. Most often compression is used to minimize storage space (on a hard drive, for example) or for reducing transmitted data over a network. In other words, Compression is the art of representing the information in a compact form rather than its original run compressed form. In other words, using the data compression, the size of a particular file can be reduced. Data compression refers to reducing the amount of space needed to store data or reducing the amount of time needed to transmit data. The size of data is reduced by removing the excessive Information.