ZIP file extension is used by compressed files in ZIP file format. ZIP files utilize lossless compression. Most common compression method used by ZIP files is DEFLATE which is a combination of LZ77 algorithm and Huffman coding.
Most modern operating systems are able to open ZIP files. In Windows OS you can just right-click on a ZIP file and choose "Extract All..." menu option. Or you can double click to view what is inside. Similar on Mac OS you can just double click on a ZIP file to open it.
You should choose "Encrypt" option when creating ZIP archive in WinZip or use -e option in zip console application.
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