Dendritic cells (DCs) are white blood cells forming part of the mammalian immune system. They process antigen material from pathogens and put it on their surface. There it touches other cells of the immune system. So, dendritic cells are antigen-presenting cells. They act as messengers between the innate and adaptive immune systems.
Dendritic cells are present in tissues in contact with the external environment. These tissues are the skin, and the inner lining of the nose, lungs, stomach and intestines. They can also be found in an immature and mature state in the blood.