Mass spectrometry is a powerful analytical technique used to identify and quantify molecules in a sample by measuring their mass-to-charge ratios. It involves ionizing the molecules, separating them based on their mass-to-charge ratio, and detecting them with a mass spectrometer. It is widely used in fields such as chemistry, biochemistry, pharmacology, and forensic science for research, quality control, and diagnosis. Mass spectrometry requires specialized knowledge and skills in sample preparation, instrument operation, data analysis, and interpretation.