Optical Emission Spectroscopy (OES) is an analytical technique used to determine the elemental composition of materials. It works by exciting atoms in a sample, causing them to emit light at characteristic wavelengths. By analyzing this emitted light, scientists can identify and quantify the elements present in the sample. OES is commonly used in various fields, including metallurgy, environmental monitoring, and materials science. The technique is valued for its speed and sensitivity, making it suitable for analyzing metals, alloys, and other materials. Instruments used in OES often include spectrometers and plasma sources to enhance detection capabilities.