Gut-associated lymphoid tissue (GALT) is a crucial part of the immune system located in the gastrointestinal tract. It includes structures like Peyer’s patches, mesenteric lymph nodes, and isolated lymphoid follicles, which help protect the body from pathogens that enter through food and drink. GALT plays a vital role in the immune response by identifying and responding to harmful microorganisms. It helps maintain a balance between tolerance to beneficial gut bacteria and the defense against harmful invaders, ensuring overall gut health and proper immune function.