A gravimeter is a scientific instrument used to measure the strength of gravitational forces at a specific location. It detects tiny variations in gravity caused by changes in mass distribution, such as mountains, valleys, or underground structures. This information is valuable in fields like geology, archaeology, and environmental science. There are different types of gravimeters, including absolute gravimeters and relative gravimeters. Absolute gravimeters provide precise measurements of gravitational acceleration, while relative gravimeters compare gravity at different locations. These instruments help scientists understand Earth's structure and monitor natural phenomena like earthquakes and volcanic activity.