Atomic Absorption Spectroscopy (AAS) is an analytical technique used to measure the concentration of specific metal elements in a sample. It works by vaporizing the sample, usually in a flame or graphite furnace, and then passing light of a specific wavelength through the vapor. Each element absorbs light at a characteristic wavelength, and the amount of absorption is directly proportional to its concentration. AAS is widely used in environmental testing, food and beverage analysis, pharmaceuticals, mining, and clinical laboratories to detect metals such as lead, cadmium, arsenic, copper, and zinc at very low levels. Its high sensitivity, accuracy, and ability to analyze trace elements make it a trusted method for ensuring safety, quality, and regulatory compliance across industries.