H. pylori, also known as Helicobacter pylori, is a type of bacteria that infects the stomach lining. It is a common bacterial infection that can cause various digestive problems, including gastritis (inflammation of the stomach lining), peptic ulcers (sores in the stomach or upper small intestine), and in some cases, stomach cancer. H. pylori is usually acquired during childhood and can persist for many years if left untreated. It is primarily transmitted through contaminated food, water, or close contact with an infected person. Treatment typically involves a combination of antibiotics and acid-suppressing medications to eradicate the bacteria and promote healing of the affected areas.