Protein engineering is a field of biotechnology that involves the design and modification of proteins to improve their functional properties or create new functionalities. This can include altering the structure, function, stability, or specificity of a protein through techniques such as site-directed mutagenesis, directed evolution, or rational design. Protein engineering has a wide range of applications in medicine, agriculture, and industry, such as developing therapeutic proteins, designing enzymes for industrial processes, or creating proteins with novel functions for research purposes. It has the potential to revolutionize various fields by providing tailored proteins with specific properties or functions.