Goblet cells are specialized epithelial cells found in various tissues, particularly in the lining of the respiratory and gastrointestinal tracts. Their primary function is to produce and secrete mucus, which serves to lubricate and protect the surfaces of these organs. This mucus traps pathogens and particles, helping to keep the tissues moist and functioning properly. These cells are named for their shape, resembling a goblet or wine glass. They contain numerous secretory granules filled with mucins, the proteins that make up mucus. Goblet cells play a crucial role in maintaining the health of the mucosal barrier and supporting the immune system.