Quantum computing is a type of computing that uses quantum bits, or qubits, to perform calculations. Qubits are particles that can exist in multiple states simultaneously, unlike classical bits, which can only exist in one state at a time. This allows quantum computers to operate on multiple pieces of data at once, potentially allowing them to solve certain problems much faster than classical computers. In simple terms, quantum computers use the principles of quantum mechanics to perform calculations that are difficult or impossible for classical computers to solve.