Researching file compression, I have learned there are hundreds of different compressed file types. They range from very rare to very common file types, with .zip, .sitx, .7z, .rar, and .gz as the most common types used. Along with the many file types, there are many different utility programs for compressing files. These same utility programs are used to decompress the files, so the files can be used. On PCs the most common methods are Utility-based file compression, which means compressing one or more files into one compress file (sometimes called archive).
The advantage of compressing files is they use less storage space on hard drives. If you need to download many files, they can be compressed together into one file. Compressed files will download faster and more data can be stored on removable media. Creating compressed files does not change or delete the original file. Also, when the file is compressed and then decompressed, it restores it back like the original file.
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