The SR flip-flop (Set-Reset flip-flop) is a basic memory storage element used in digital circuits. It has two inputs, S (Set) and R (Reset), and two outputs, Q and Q̅ (the inverse of Q). Here's how it works:

• S (Set) = 1, R (Reset) = 0: This makes the output Q = 1, meaning the flip-flop is "set" to store a 1.
• S (Set) = 0, R (Reset) = 1: This makes the output Q = 0, meaning the flip-flop is "reset" to store a 0.
• S (Set) = 0, R (Reset) = 0: The flip-flop "holds" its previous state, meaning Q stays whatever it was before.
• S (Set) = 1, R (Reset) = 1: This is an invalid state in an SR flip-flop, as both outputs (Q and Q̅) would be 0, which contradicts the normal behavior.

In short, the SR flip-flop stores a binary state (either 0 or 1) and can be controlled using the Set and Reset inputs.