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 (user interfaces)
- Database normalization, the elimination of redundancy in databases
- Redundancy (information theory)
- Redundancy (language)
- Redundancy (law), a reason for dismissal of an employee in the United Kingdom
- Redundancy (total quality management)