Have you ever downloaded an email attachment or file that your computer couldn't open? If the name of the file ended with .zip, .rar or .7z, that means it's a compressed archive file.
Or have you ever pulled together a handful of favorite vacation or holiday pictures to share, only to learn that they are "too big" to email? Whether receiving a big file from someone else or trying to send your own oversized file, compressing the file can be a great solution.
A compressed file simply indicates it was squished down to fit into a smaller size. Compressing a file can save some serious space on your hard drive. It can also sometimes be the only way to allow it to be small enough to share via the Internet and email.
While newer versions of Windows can open .zip files, it doesn't handle other archived file types. Plus, creating your own archived files can be tricky. What you need is a program that can help you open up nearly any compressed file and make your own compressed files of whatever you need.