Recombinant proteins are proteins that are produced through recombinant DNA technology, which involves inserting genes from one organism into the DNA of another organism. This process allows for the production of proteins that are not naturally produced by the host organism, or for the production of proteins in larger quantities and with higher purity than can be obtained from their natural sources. Recombinant proteins have a wide range of applications, including in medicine, agriculture, and biotechnology. They are commonly used in the production of vaccines, therapeutic proteins, enzymes, and research tools. Additionally, recombinant proteins are often used in the development of new drugs and in biotechnological processes such as the production of biofuels and food additives.