Laser-cooled atoms are atoms that have been slowed down significantly using laser light. When lasers are directed at these atoms, they interact with the light in a way that reduces their kinetic energy, causing them to move more slowly. This cooling process allows scientists to study the atoms in greater detail and observe their quantum behaviors. This technique is essential in fields like quantum physics and atomic physics, where understanding the properties of atoms at low temperatures can lead to advancements in technologies such as quantum computing and atomic clocks. By achieving temperatures close to absolute zero, researchers can explore new states of matter and fundamental physical principles.