Files that contain the .cbz file extension are compressed archive files that are used for a specific purpose. The CBZ file format is used when a user wants to take multiple files with specific contents and compress those files into a single archive folder.The CBZ file archive will usually contain comic book images that have been organized into pages and then saves the resulting archive with the .cbz file extension. The .cbz extension stands for Comic Book Zip file. This is because the CBZ files are ZIP archive files that have renamed with the .cbz file extension in order to reflect the contents that are being stored in that particular ZIP archive.