In computer programming, redundant code is source code or compiled code in a computer program that has any form of redundancy, such as recomputing a value that has previously been calculated and is still available, code that is never executed (known as unreachable code), or code which is executed but has no external effect (e.g., does not change the output produced by a program; known as dead code).
A NOP instruction might be considered to be redundant code that has been explicitly inserted to pad out the instruction stream or introduce a time delay, for example to create a timing loop by "wasting time". Identifiers that are declared, but never referenced, are termed redundant declarations.
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