What is the controlled-controlled-Y gate?

What is the controlled-controlled-Y gate?

The controlled-controlled-Y gate, also known as the Toffoli gate, is a three-qubit gate in quantum computing. It performs a controlled-Y operation on the target qubit if and only if both control qubits are in the state |1⟩. If either or both of the control qubits are in the state |0⟩, the target qubit remains unchanged. The gate is named after Tommaso Toffoli, who introduced it in 1980.