.ZIP File Extension Description:

File extension .ZIP denotes a ZIP archive. This is the most preferred method for users to transmit electronic books, applications, screensavers, and games, among other large files. These files are used particularly on environments such as Windows or DOS.

These files are created using a creation tool for zip files. These tools take group files and compress them together into a single archive file, at times reducing on amounts of space taken on the hard disk. Following the transference of the zipped file, the recipient unzips it, which causes the hard disk to register the original file.

Learn more about .ZIP files here: http://zip.file-extension-library.com/