Introduction Biochemistry is a fundamental scientific discipline that combines principles of chemistry and biology to study the chemical processes occurring within living organisms. It focuses on understanding the molecular basis of life and explains how biological molecules interact to sustain cellular functions. Definition of Biochemistry Biochemistry is the branch of science that deals with the study of the chemical composition of living cells and the biochemical reactions essential for life. It examines biomolecules such as proteins, carbohydrates, lipids, nucleic acids, and enzymes, and investigates their structure, function, and interactions. Importance of Biochemistry Biochemistry plays a vital role in many scientific and medical fields. Its importance includes: Understanding metabolic pathways and energy production. Explaining the mechanism of enzyme and hormone action. Assisting in the diagnosis and treatment of diseases. Supporting drug discovery and pharmaceutical research. Providing insight into genetic information and molecular biology. Branches of Biochemistry Biochemistry is divided into several major branches, including: Structural Biochemistry: Studies the chemical structure of biomolecules. Metabolic Biochemistry: Focuses on metabolic pathways and biochemical reactions. Clinical Biochemistry: Applies biochemical knowledge in medical diagnosis and laboratory analysis. Molecular Biochemistry: Concentrates on DNA, RNA, and protein synthesis at the molecular level. Relationship with Other Sciences Biochemistry is closely related to medicine, pharmacology, microbiology, and biotechnology. It serves as a bridge between chemistry and biology, enabling a deeper understanding of disease mechanisms and the development of effective therapies. Conclusion Biochemistry is a cornerstone of modern science, providing essential knowledge about the chemical processes of life. Advances in biochemistry have significantly contributed to medical progress, improved disease management, and enhanced scientific research.