Express Zip is a simple and easy-to-use file compression and decompression software that supports multiple file formats including ZIP, RAR, CAB, TAR, 7Z, and ISO. It has fast compression and decompression functions, allowing users to easily manage files through drag and drop operations, while providing password protection to ensure the security of ZIP files. The main functions of Express Zip also include creating new ZIP files, managing ZIP file content, encrypting and converting archive files, quick access to right-click menus, splitting large files into multiple parts, and creating recovery files to repair damaged archives.