Winzip and WinRar are commonly used programs to compress and decompress files. WinRAR can work with both ZIP and RAR file formats and is able to decompress files from other formats, so it is not necessary to have both Winzip and WinRar installed. An archive is a file that has been compressed to take up less space on a hard drive and can be stored in different locations like a hard drive, CD, or flash drive. When files are compressed, they are given a file extension like ZIP or RAR to indicate the file type.