CGS, or Centimeter-Gram-Second, is a metric system of units used to measure physical quantities. It is based on three fundamental units: the centimeter for length, the gram for mass, and the second for time. This system is often used in scientific contexts, particularly in fields like physics and chemistry. The CGS system is part of the broader metric system, which includes other units such as the meter, kilogram, and second. While CGS is less commonly used today compared to the SI (International System of Units), it remains important in certain scientific disciplines and historical contexts.