Here's what you need to do: Open the Files app and browse through your files, or use the search bar to find the zip file you want to unzip. Tap on the zip file and select the Extract option.

Once you unzip a file on your Chromebook, you can copy and paste its contents to any other folder on the computer.

How to unzip RAR files on a Mac Comparable to ZIP files, Roshal Archive (RAR) is another file format where you're able to hold large amounts of compressed data.