A file with the ZIP file extension is a ZIP compressed file and is the most widely used archive format you’ll encounter. A ZIP file, like other archive file formats, is simply a collection of one or more files and folders compressed into a single file for easy transportation and compression.
If you encounter a lesson with multiple Downloadable Resources, you have the option to download all of the resources at one time. If you select this option, the files will be downloaded as a ZIP file.
How do I open a ZIP file?
The easiest way to open a ZIP file is to double-click on it and let your computer show you the folders and files contained inside. In most operating systems, including Windows and macOS, ZIP files are handled internally, without the need for any extra software.