Tandem mass spectrometry, often abbreviated as MS/MS, is an advanced analytical technique used to determine the molecular structure of compounds. In this method, molecules are first ionized and then fragmented into smaller pieces in a process known as collision-induced dissociation. These fragments are then analyzed in a second mass spectrometer. The strength of tandem mass spectrometry lies in its ability to provide detailed information about the molecular structure and sequence of the analyzed compound, such as peptides in proteomics or other organic molecules. This highly sensitive and accurate technique makes it indispensable in fields like biochemistry, pharmacology, and environmental analysis. Its ability to analyze complex mixtures and identify specific compounds at very low concentrations has significantly advanced scientific research and diagnostics.