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. 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. By processing and presenting antigens, dendritic cells help initiate an immune response, making them essential for maintaining overall health and immunity against diseases.