WinZip is a software application used for file compression and decompression. It allows users to reduce the size of files and folders, making them easier to store and share. By compressing files, WinZip helps save disk space and speeds up file transfers over the internet. In addition to compression, WinZip supports various file formats, including ZIP, RAR, and 7Z. The software also offers features like file encryption for security, backup options, and integration with cloud storage services. Overall, WinZip is a versatile tool for managing files efficiently.