This document provides an overview of gas chromatography. It discusses the basic principles and components of gas chromatography including the stationary and mobile phases, how samples are injected and separated in the column based on their partitioning properties. Key components like the carrier gas, temperature control, detectors, and columns are described. The document outlines some parameters used to evaluate chromatography performance and lists common applications of gas chromatography in fields like pharmaceutical analysis, food testing, and environmental analysis.