Dead code refers to parts of a codebase that exist but are never executed or have no effect on the program’s outcome. This includes unused functions, unreachable conditions, or variables that are never referenced. While dead code does not alter how an application runs, it adds unnecessary weight, creates confusion, and makes both development and testing harder to maintain.From a testing perspective, dead code often appears in coverage reports as lines that are never executed. Identifying it can be done through practices such as static analysis, where automated checks highlight unreachable or unused code, or through code coverage, where unexecuted paths stand out during test runs. Development environments may also issue warnings about unused variables or unreachable logic. In addition, runtime monitoring and peer reviews are effective ways to confirm whether suspicious blocks of code are ever exercised.Removing dead code improves clarity, reduces the effort of writing and maintaining tests, and ensures test results focus only on the active and meaningful parts of the system.