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2. ZIP (file format) - Wikipedia

   en.wikipedia.org/wiki/ZIP_(file_format)

   ZIP is an archive file format that supports lossless data compression.A ZIP file may contain one or more files or directories that may have been compressed. The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common.

3. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   This means that compressed archives with the UC2 file extension can hold almost 1 million files. .uca PerfectCompress [17] Windows: Windows: No Based on PAQ, RZM, CSC, CCM, and 7zip. The format consists of a PAQ, RZM, CSC, or CCM compressed file and a manifest with compression settings stored in a 7z archive. .uha UHarc DOS/Windows: DOS/Windows ...

4. Zip - Wikipedia

   en.wikipedia.org/wiki/Zip

   ZIP (file format), a compressed archive file format whose typical file extension is .zip. zip, a command-line program from Info-ZIP; Zipping (computer science), or zip, reorganizing lists of lists; Zip drive, a removable disk storage system; Zone Information Protocol, AppleTalk protocol; Zip Chip, Apple II accelerators by Zip Technologies

5. gzip - Wikipedia

   en.wikipedia.org/wiki/Gzip

   gzip is a file format and a software application used for file compression and decompression.The program was created by Jean-loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix systems, and intended for use by GNU (from which the "g" of gzip is derived).

6. List of file formats - Wikipedia

   en.wikipedia.org/wiki/List_of_file_formats

   ?Q? – files that are compressed, often by the SQ program. 7z – 7-zip compressed file; A – an external file extension for C/C++; AAC – Advanced Audio Coding; ABB – Android App Bundle – is the Android (and Android TV) application publishing file format (required by Google Play) taking over from:

7. Data compression ratio - Wikipedia

   en.wikipedia.org/wiki/Data_compression_ratio

   Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes: