A recombinant vaccine is a type of vaccine created by using genetic engineering techniques. It involves inserting a gene from a pathogen, such as a virus or bacterium, into a harmless organism, often a yeast or bacteria. This organism then produces a protein that mimics the pathogen, stimulating the immune system to recognize and fight the actual pathogen if encountered in the future. These vaccines are designed to provide immunity without causing disease. Examples include the human papillomavirus (HPV) vaccine and the hepatitis B vaccine. Recombinant vaccines are generally safe and effective, making them an important tool in preventing infectious diseases.