Files with the .7z extension are very similar to Zip files. These files are compressed archive files, usually created by the 7-Zip file archive utility.
7Z files can make it easier to send files and folders over email and the Web. The 7Z file format also makes it easier to download files from the Web due to the reduced file size. By taking multiple files and compressing them into a single .7z file, the download times are significantly reduced and large batches of files become more easily manageable.
The .7z file format has a very high compression ratio and offers encryption functionality.
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