Innate Lymphoid Cells type 3 (ILC3) are a subset of immune cells that play a crucial role in maintaining the body's defenses, particularly in mucosal tissues like the gut. They are part of the innate immune system, which responds quickly to infections and helps regulate inflammation. ILC3s are known for producing important signaling molecules called cytokines, which help coordinate the immune response. These cells are particularly important for protecting against pathogens and maintaining a healthy balance of gut microbiota. ILC3s can also influence the development of other immune cells, such as T cells, and are involved in the healing process after tissue damage. Their proper function is essential for overall immune health.