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en.wikipedia.org/wiki/Data_compression

Thus, one can consider data compression as data differencing with empty source data, the compressed file corresponding to a "difference from nothing." This is the same as considering absolute entropy (corresponding to data compression) as a special case of relative entropy (corresponding to data differencing) with no initial data.

www.techopedia.com/definition/884/data-compression

A common data compression technique removes and replaces repetitive data elements and symbols to reduce the data size. Data compression for graphical data can be lossless compression or lossy compression, where the former saves all replaces but save all repetitive data and the latter deletes all repetitive data.

www.businessdictionary.com/definition/data-compression.html

The same program is used to decompress (decrypt) the data so that it can be heard, read, or seen as the original data. Compression ratios of 1:10 to 1:20 (or much higher, with emerging technologies) are routinely achieved with common types of data, resulting in much smaller storage space requirements or much faster communications.

www.webopedia.com/TERM/D/data_compression.htm

In addition, there are file compression formats, such as ARC and ZIP. Data compression is also widely used in backup utilities, spreadsheet applications, and database management systems. Certain types of data, such as bit-mapped graphics, can be compressed to a small fraction of their normal size.

www.ics.uci.edu/~dan/pubs/DataCompression.html

Data compression may be viewed as a branch of information theory in which the primary objective is to minimize the amount of data to be transmitted. The purpose of this paper is to present and analyze a variety of data compression algorithms.

docs.microsoft.com/.../data-compression/data-compression

To perform archival compression, SQL Server runs the Microsoft XPRESS compression algorithm on the data. Add or remove archival compression by using the following data compression types: Use COLUMNSTORE_ARCHIVE data compression to compress columnstore data with archival compression. Use COLUMNSTORE data compression to decompress archival ...

answers.yahoo.com/question/index?qid=20090827101514AAhCuLG

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www.coursehero.com/file/p266vv/12-Explain-the-purpose-of...

sorting, and grouping commands for the purpose of retrieving data. 12. Explain the purpose of data compression techniques. Coding and compression techniques reduce storage space and can increase data integrity. Data compression techniques are pattern matching and other methods that replace repeating strings of characters with codes of shorter lengths, thus reducing data storage requirements.

searchstorage.techtarget.com/definition/compression

Data compression algorithms reduce the size of the bit strings in a data stream that is far smaller in scope and generally remembers no more than the last megabyte or less of data. Taneja Group analyst Mike Matchett discussed the benefits of compression and deduplication and how the two differ.

www.bc.edu/offices/help/essentials/backup/compression.html

File compression allows you to store and back up significantly more data, faster. To effectively post files on a web page for someone else to download or to send large documents as email attachments. Files can become corrupted when they are transferred over the internet in an uncompressed format. Transfer time is lessened when files are compressed.