To unzip a file on your computer or phone, you can use tools that come pre-installed on the device. In some cases, using a third-party app might help.

Occasionally, you'll need to open several compressed files from one ZIP folder. While Windows does a fine job extracting, there are better tools to unzip.

You can open RAR files on your Mac computer with free apps like The Unarchiver. RAR is a compressed file format – similar to ZIP – that can hold many files in one place, and is especially ...