(n.) 1. Instances in which multiple interchangeable components perform a single function to minimize the effects of failures and errors. One common form of hardware redundancy is disk mirroring. Redundancy can also be used to detect and recover from errors in software. A common example is the cyclic redundancy check (CRC), which adds redundant data to a block in order to detect corruption during storage or transmission. 2. The process of digitizing or capturing the same data or descriptive information more than once. Copies of the same data are redundant. Compression routines throw out the redundant data.