Dendritic cells are a type of immune cell that play a crucial role in the body's defense system. They act as messengers between the innate and adaptive immune systems, capturing and presenting antigens from pathogens to T cells. This process helps the body recognize and respond to infections effectively. These cells are found in various tissues, especially in areas that are in contact with the external environment, such as the skin and mucosal surfaces. Dendritic cells are essential for initiating immune responses and maintaining immune tolerance, ensuring that the body can distinguish between harmful invaders and its own cells.