High-power lasers is a research field and technological domain concerned with the generation, amplification, and application of laser radiation characterised by exceptionally high peak power (often reaching terawatts or petawatts) or high average power. This area investigates fundamental light-matter interactions under extreme electromagnetic field strengths and explores their significance across diverse applications, including inertial confinement fusion, advanced particle acceleration, precision materials processing, and fundamental physics studies of vacuum polarization and relativistic plasma dynamics.