Quantum computers can perform three main types of operations:

1. Superposition: Qubits can exist in multiple states simultaneously, allowing them to process multiple possibilities at the same time.
2. Entanglement: Qubits can become "entangled," meaning that the state of one qubit is dependent on the state of another qubit, even if they are separated by large distances.
3. Measurement: When a qubit is measured, its state collapses to one of the possible states, allowing the computer to determine the outcome of the calculation.