In digital electronics, a NAND (NOT AND) gate is a logic gate which produces an output which is false only if all its inputs are true; thus its output is complement to that of an AND gate.
What is a NAND Gate? A NAND gate (“not AND gate”) is a logic gate that produces a low output (0) only if all its inputs are true, and high output (1) otherwise. Hence the NAND gate is the inverse of an AND gate, and its circuit is produced by connecting an AND gate to a NOT gate.
Digital Electronics Tutorial about the Logic NAND Gate and the Logic NAND Gate Truth Table used in digital TTL and CMOS logic gate circuits
The NAND gate: tiny but mighty! Explore why it's called a universal gate and how it's used to build ALL logic circuits. Demystify digital logic with this beginner's guide!