Avian influenza, commonly known as bird flu, is a viral infection that primarily affects birds, especially domestic poultry like chickens and ducks. The virus can spread through direct contact with infected birds, their droppings, or contaminated surfaces. While many strains are mild, some can be highly pathogenic, leading to severe illness and death in birds. Humans can occasionally contract avian influenza, usually through close contact with infected birds. Symptoms in humans can range from mild flu-like signs to severe respiratory illness. Monitoring and controlling outbreaks in bird populations is crucial to prevent potential transmission to humans and other animals.