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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.

en.wikipedia.org/wiki/Data_compression_ratio

Data compression ratio, also known as compression power, is a measurement of the relative reduction in size of data representation produced by a data compression algorithm.It is typically expressed as the division of uncompressed size by compressed size.

en.wikipedia.org/wiki/Lossless_data_compression

Lossless compression is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data. By contrast, lossy compression permits reconstruction only of an approximation of the original data, though usually with improved compression rates (and therefore reduced file sizes). Lossless data compression is used in many applications.

en.wikipedia.org/wiki/Lossy_compression

In information technology, lossy compression or irreversible compression is the class of data encoding methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used to reduce data size for storing, handling, and transmitting content.

en.wikipedia.org/wiki/Compression

Physical science. Compression (physics), the result of the subjection of a material to compressive stress Compression member, a class of structural elements, of which a column is the most common specific example; Compressibility, a measure of volume change resulting from pressure; Gas compression, raising the pressure and reducing the volume of gases ...

itlaw.wikia.org/wiki/Data_compression

Data compression is useful because it helps reduce the consumption of expensive resources, such as hard disk space or transmission bandwidth. On the downside, compressed data must be decompressed to be used, and this extra processing may be detrimental to some applications.

simple.wikipedia.org/wiki/Data_compression

Data compression is a set of steps for packing data into a smaller space, while allowing for the original data to be seen again. Compression is a two-way process: a compression algorithm can be used to make a data package smaller, but it can also be run the other way, to decompress the package into its original form. Data compression is useful in computing to save disk space, or to reduce the ...

wiki.kidzsearch.com/wiki/Data_compression

Data compression is a set of steps for packing data into a smaller space, while allowing for the original data to be seen again. Compression is a two-way process: a compression algorithm can be used to make a data package smaller, but it can also be run the other way, to decompress the package into its original form. Data compression is useful in computing to save disk space, or to reduce the ...

sco.wikipedia.org/wiki/Data_compression

Lossy compression reduces bits bi remuivin unnecessary or less important information. The process o reducin the size o a data file is referred tae as data compression. In the context o data transmission, it is cried soorce codin (encodin duin at the soorce o the data afore it is stored or transmittit) in opposeetion tae channel codin.

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.