Avian circovirus is a small virus that primarily affects birds, particularly poultry species like chickens and turkeys. It belongs to the family Circoviridae and is known for causing various health issues, including avian beak and feather disease (ABFD) in psittacine birds. The virus is resistant to many environmental conditions, making it challenging to control in affected flocks. Infected birds may show symptoms such as feather loss, poor growth, and immune system suppression. Vaccination and good management practices are essential for preventing the spread of avian circovirus in bird populations. Early detection and biosecurity measures can help minimize its impact on poultry health.