gen-in-3-4-sentences-explain-redundancy-and-parity-state-any-key-2ac6

In 3-4 sentences, explain redundancy and parity. State any key formula.

**Redundancy** is the practice of storing extra data beyond what's strictly needed, allowing for error detection and correction if some data is lost or corrupted. **Parity** is a simple form of redundancy that adds one extra bit to indicate whether the number of 1s in a data sequence is even or odd, enabling single-bit error detection. The **parity bit formula** is: P = b₁ ⊕ b₂ ⊕ b₃ ⊕ ... ⊕ bₙ (where ⊕ represents XOR operation), which equals 0 for even parity and 1 for odd parity. While parity can detect single-bit errors, more sophisticated redundancy schemes like RAID or error-correcting codes can both detect and correct multiple errors.