Dendritic cell (DC) vaccines are a type of immunotherapy designed to harness the body's immune system to fight diseases such as cancer. These vaccines utilize dendritic cells, which are potent antigen-presenting cells that play a critical role in initiating and regulating immune responses. The process involves isolating dendritic cells from a patient, loading them with tumor antigens, and then reintroducing them into the patient to stimulate a targeted immune attack against cancer cells.