Recombinant gene expression refers to the process of genetically engineering organisms to produce specific proteins or other molecules. There are several synonymous terms that are used to describe this process, including genetic engineering, gene manipulation, gene splicing, gene cloning, and biotechnology. These terms all refer to the manipulation of genes to produce a desired result, such as the production of insulin for treating diabetes or the creation of plants that are resistant to pests. The use of recombinant gene expression has revolutionized many fields, including medicine, agricultural science, and biotechnology, and continues to be an important area of research and development.