A Geiger Counter is a device used to measure radiation levels in the environment. It detects ionizing radiation, which can come from sources like radioactive materials or nuclear power plants. When radiation passes through the Geiger Counter, it ionizes the gas inside, creating a small electrical pulse. This pulse is then counted and displayed, often as clicks or on a digital screen. These devices are important for safety, especially in areas where radiation exposure could be harmful. They help scientists, nuclear workers, and emergency responders monitor radiation levels and ensure that they stay within safe limits, protecting both people and the environment.