Abstract: Using popular but accurate descriptions, I briefly introduce the concepts concerning quantum computation, including qubits,
quantum state, basis state, quantum measurement, unitary transformation, noncloning of quantum information, quantum computing,
quantum gate, quantum algorithm, decoherence or quantum noise, quantum error correction, noisy intermidiate-scale quantum (NISQ)
technology and quantum advantage or quantum supremacy. NISQ era and the prospect of quantum supremacy are commented.