Data compression is the compacting of information by lowering the number of bits which are stored or transmitted. As a result, the compressed info needs less disk space than the initial one, so much more content could be stored using the same amount of space. There're various compression algorithms that work in different ways and with many of them only the redundant bits are deleted, which means that once the information is uncompressed, there's no decrease in quality. Others remove unneeded bits, but uncompressing the data following that will result in reduced quality in comparison with the original. Compressing and uncompressing content takes a significant amount of system resources, particularly CPU processing time, therefore every hosting platform that employs compression in real time must have enough power to support this feature. An example how data can be compressed is to replace a binary code such as 111111 with 6x1 i.e. "remembering" the number of sequential 1s or 0s there should be instead of storing the actual code.