Biochemistry is the study of chemical processes within living organisms, bridging biology and chemistry to uncover the molecular mechanisms that sustain life. It plays a vital role in understanding the structure and function of biomolecules such as proteins, enzymes, DNA, and lipids. Biochemistry drives advancements in healthcare through drug development, diagnostics, and personalized medicine, while also enhancing agricultural practices with improved crop yields and pest resistance. Environmental applications include pollution control and sustainable resource management.