Gas Chromatography is a laboratory technique used to separate and analyze compounds in a mixture. It works by vaporizing the sample and passing it through a column filled with a stationary phase. As the gas moves through the column, different components of the mixture travel at different speeds, allowing them to be separated. Once separated, the compounds are detected and quantified, often using a mass spectrometer or a flame ionization detector. This method is widely used in various fields, including environmental testing, food safety, and forensic science, due to its high sensitivity and accuracy in identifying substances.