In a standard ZIP, each file is compressed individually. In a "solid" 7z archive, all files are treated as one massive data block.
The .7z format, created by 7-Zip , uses a method called to achieve much smaller file sizes than traditional formats like ZIP. aimstype.7z
Unlike some proprietary formats, 7-Zip is open-source and widely considered safe for distributing large software packages. In a standard ZIP, each file is compressed individually