Tandem mass spectrometry (MS/MS) is a highly specialized analytical technique used to identify and quantify molecules in complex samples by breaking them down into smaller fragments and analyzing those fragments. It is commonly used in fields such as proteomics, metabolomics, and environmental science to identify and quantify proteins, metabolites, and pollutants in biological samples or environmental matrices. However, performing MS/MS requires extensive training and expertise in using highly specialized instruments and interpreting complex data, making it a skill that is generally restricted to highly trained analysts or specialized laboratories.