NAND is a type of digital logic gate that produces an output that is false only when all its inputs are true. It combines the functions of an AND gate and a NOT gate, meaning it inverts the result of an AND operation. This makes NAND a fundamental building block in digital electronics, widely used in various circuits and systems. In computer memory, NAND flash is a non-volatile storage technology that retains data even when power is turned off. It is commonly used in devices like USB drives, solid-state drives (SSDs), and memory cards due to its efficiency and speed in reading and writing data.