Disk compression refers to the process of reducing the size of data on a disk, without losing any of the original data. This process can be achieved through different means, and there are a range of synonyms for the term "disk compression". Some of the most commonly used synonyms include file compression, data compression, storage compression, and disk space optimization. Other terms that are sometimes used interchangeably with disk compression include disk defragmentation, disk cleanup, and data deduplication. The goal of any form of disk compression is to reduce the amount of disk space used by data, while maintaining the integrity and accessibility of that data.