Biochemistry is the branch of science that explores the chemical processes and substances that occur within living organisms. It focuses on understanding the molecular mechanisms of biological phenomena, including the structure and function of biomolecules such as proteins, nucleic acids, lipids, and carbohydrates. By integrating principles of chemistry and biology, biochemistry seeks to unravel the complex interactions that govern cellular processes, metabolism, genetic information, and cell signaling, thereby contributing to advancements in fields like medicine, genetics, and biotechnology.