Isotopic composition refers to the relative abundance of different isotopes of an element in a sample. Isotopes are variants of an element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. Studying the isotopic composition of a sample can provide valuable information about its origin, history, and processes it has undergone. Researchers use mass spectrometry and other analytical techniques to measure and analyze isotopic compositions. By comparing the ratios of different isotopes in a sample to known standards, researchers can determine the source of a material, track its movement through the environment, or unravel chemical reactions and biological processes. Isotopic composition is widely used in various fields such as geology, chemistry, biology, archaeology, and environmental science. It can provide insights into the formation of the Earth, the movements of animals in ecosystems, the diet of ancient civilizations, and the effects of climate change. Overall, isotopic composition analysis is a powerful tool for understanding the natural world and the processes that shape it.