What is the controlled-controlled-X gate?

What is the controlled-controlled-X gate?

The controlled-controlled-X gate, also known as the Toffoli gate, is a three-qubit gate in quantum computing. It performs the controlled-NOT (CNOT) operation on the third qubit (target qubit) if and only if both the first and second qubits (control qubits) are in the state |1⟩. If the control qubits are in the state |0⟩, the target qubit remains unchanged. This gate is commonly used in quantum algorithms and quantum error correction codes.