Enzymes play a crucial role in biological reactions as catalysts. They speed up the rate of chemical reactions by lowering the activation energy required for the reaction to proceed. Each enzyme is highly specific, typically catalyzing only one type of reaction or acting on a particular substrate. Enzymatic activity is vital for numerous physiological processes, including digestion, metabolism, and DNA replication. Understanding how enzymes function is essential in biochemistry and medicine, particularly in developing drugs and treatments for various diseases.