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Data compression is a fundamental computer science issue.
Compressed data is data that has been passed through a data compression software system.
Uncompressed data is data that has not been passed through a data compression software system.
Fundamental compression methods
Data compression topics:
A very simple data compresson algorithm would be to replace all instances of the string 'this_is_a_long_string' with '514a' in a text file.
Closely allied with data compression is field of [information coding]? and cryptography.
Common Data compression algorithms:
The idea of data compression is deeply connected with statistic inference and particularly with the maximum likelihood principle.