A magnetic trap is a device that uses magnetic fields to confine charged particles, such as electrons or ions. This technology is often employed in fields like plasma physics and fusion research, where controlling high-energy particles is essential for experiments and energy generation. In a magnetic trap, the magnetic field creates a potential well that keeps the particles from escaping. This principle is crucial for devices like tokamaks, which aim to achieve nuclear fusion by maintaining a stable plasma state. By effectively trapping particles, researchers can study their behavior and interactions in a controlled environment.