A AND B is a logical operation used in computer science and mathematics. It evaluates two conditions, A and B, and returns true only if both conditions are true. This operation is fundamental in programming and digital circuit design, where it helps in decision-making processes. In the context of Boolean algebra, A AND B can be represented using the symbol "∧". For example, if A represents the statement "It is raining" and B represents "I have an umbrella," then A AND B is true only when both statements are true. This concept is essential for constructing complex logical expressions and algorithms.