Small molecule analysis is a branch of analytical chemistry focused on the identification, quantification, and characterization of small molecules in various substances. These molecules typically have a low molecular weight and include compounds such as drugs, metabolites, pesticides, and pollutants. Techniques used in small molecule analysis include chromatography (such as gas chromatography and liquid chromatography), mass spectrometry, spectroscopy, and nuclear magnetic resonance (NMR). This field is essential in pharmaceuticals, environmental monitoring, forensics, and many other scientific disciplines where precise identification and quantification of small molecules are crucial.