ILC3, or Innate Lymphoid Cells type 3, are a subset of immune cells that play a crucial role in the body's defense against infections. They are primarily found in mucosal tissues, such as the gut, and are involved in maintaining the balance of the immune system. ILC3 cells produce important signaling molecules called cytokines, which help coordinate the immune response. These cells are particularly important for protecting against certain pathogens and for promoting tissue repair. ILC3 cells are also involved in the development of Th17 cells, which are essential for combating fungal and bacterial infections. Their proper functioning is vital for overall immune health.