Data compression is the compacting of info by decreasing the number of bits which are stored or transmitted. Thus, the compressed information needs much less disk space than the initial one, so extra content could be stored on the same amount of space. There're various compression algorithms that function in different ways and with many of them only the redundant bits are deleted, therefore once the information is uncompressed, there's no loss of quality. Others delete unneeded bits, but uncompressing the data following that will lead to reduced quality compared to the original. Compressing and uncompressing content takes a large amount of system resources, especially CPU processing time, so every web hosting platform which employs compression in real time must have adequate power to support that attribute. An example how info can be compressed is to replace a binary code such as 111111 with 6x1 i.e. "remembering" what number of sequential 1s or 0s there should be instead of storing the whole code.