 Enzymes are proteins that act as catalysts for chemical reactions. They have been used extensively in the chemical industry since they can improve existing processes and reduce costs. Recent advances in enzyme technology have led to new applications in the food, feed and cosmetics industries. Additionally, the global enzyme market has grown significantly due to increased demand and improved production methods. China is one of the largest producers of enzymes, but there is still room for improvement in terms of efficiency and cost reduction. Metagenomics, cell surface display technology, and cell-free systems may provide solutions to these challenges. This article was authored by Xuangli, Xiaofeng Yang, Chuyang, and others.