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Chemistry is a branch of science that focuses on the study of matter—what it is made of, how it is structured, and how it behaves. It examines atoms, molecules, and ions, which are the basic building blocks of all substances. Chemistry explains how these particles interact, bond, and rearrange during chemical reactions to create new substances with different properties.

It also studies the energy involved in these changes, such as heat, light, or electricity released or absorbed during reactions. Chemistry is divided into several fields, including organic chemistry (carbon-based compounds), inorganic chemistry (non-carbon compounds), physical chemistry (how matter behaves and changes at a molecular level), analytical chemistry (identifying substances), and biochemistry (chemistry of living organisms).

Overall, chemistry helps us understand natural processes and develop useful products like medicines, fuels, plastics, food additives, and cleaning agents, making it essential to everyday life and modern technology.