The intestinal barrier is a crucial component of the gastrointestinal system that plays a key role in maintaining the integrity of the gut and protecting the body from harmful substances. This barrier is comprised of a layer of epithelial cells lining the intestines, along with tight junctions that help regulate the passage of molecules and nutrients. Dysfunction of the intestinal barrier can lead to various health issues, including inflammatory bowel diseases, food allergies, and autoimmune disorders. Research in this area often focuses on understanding the mechanisms underlying intestinal barrier function and identifying strategies to improve its integrity and function.