Biocatalysts are natural substances, often proteins called enzymes, that speed up chemical reactions in living organisms. They play a crucial role in processes like digestion and metabolism, helping break down food into energy. By lowering the energy needed for reactions, biocatalysts make these processes more efficient and faster. In industry, biocatalysts are used in various applications, such as producing biofuels and pharmaceuticals. For example, lipases are enzymes that help convert fats into biodiesel, while amylases break down starches into sugars. Using biocatalysts is often more environmentally friendly than traditional chemical methods, making them a popular choice in sustainable practices.