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'Redundancy', in general terms, refers to the quality or state of being ''redundant'', that is: exceeding what is necessary or normal; or duplication. This can have a negative connotation, especially in rhetoric: superfluous or repetitive; or a positive implication, especially in engineering: serving as a duplicate for preventing failure of an entire system.
The term ''redundancy'' is used, with variations on the above meanings, in the following fields:

★ Redundancy, being redundant

★ Redundancy (user interfaces)

★ Database normalization, the elimination of redundancy in databases

★ Redundancy (engineering)

★ Data redundancy

★ Boolean/Logic redundancy

★ Redundancy (information theory)

★ Redundancy (language)

★ Redundancy (layoff), dismissal of an employee for lack of available work

★ Redundancy (programming), a term used in computer programming

★ Redundancy (total quality management)

★ "Redundant", a song recorded by the American rock band Green Day in 1997.