Mucosal Surfaces are the Moist linings of the Body's cavities, such as the respiratory, gastrointestinal, and Urogenital tracts, which serve as Critical barriers and Interfaces for immune responses and Pathogen Entry. They play a crucial role in Maintaining Homeostasis by facilitating Nutrient Absorption, Secreting mucus, and housing a Diverse microbiota that interacts with the immune system.