Trapped ions are charged particles that are confined in a small space using electromagnetic fields. This technique allows scientists to isolate individual ions, making them easier to study. Trapped ions are often used in quantum computing and precision measurements because they can be manipulated with high accuracy. The process of trapping ions typically involves using a device called a Paul trap or a Penning trap. These devices create electric or magnetic fields that hold the ions in place. Researchers can then perform experiments to explore the properties of the ions or to develop new technologies, such as quantum computers.