Abstract: The 2023 Nobel Prize in Physics, awarded for attosecond optical pulse generation, has attracted much attention. Attosecond pulse generation is realized through the creation of high harmonics with femtosecond laser pulses, and requires several key technologies, including femtosecond pulse compression, carrier-envelope-phase control, and pulse intensification. This article briefly reviews the generation, future development, and various applications of attosecond pulses.