Laser cooling is a technique used to slow down the movement of atoms through the use of laser light. This process involves shining lasers on a group of atoms, which causes them to absorb and emit photons. When the atoms emit photons, they also lose some of their momentum, ultimately causing them to slow down. This cooling method is used in various scientific fields, such as quantum physics and atomic physics, to achieve ultra-low temperatures and investigate the behavior of atoms at the quantum level. Laser cooling has also led to the development of technologies like atomic clocks and quantum computers.