The extension indicates that the file contains one or more compressed items, such as text documents, images, or folders, bundled into a single smaller file to make sharing or storage easier. Key Details

The 7z format uses high-ratio compression (LZMA/LZMA2), which often makes files significantly smaller than standard ZIP archives.

These files can be encrypted with strong AES-256 encryption , meaning you might need a password to open it if the creator set one.