antigen-antibody complex

An antigen-antibody complex forms when an antibody, a protein produced by your immune system, binds to a specific part of a foreign substance called an antigen—such as a bacteria, virus, or toxin. This binding helps your immune system recognize and target the invader for destruction or removal. The complex acts as a visible marker, making it easier for other immune cells to identify and attack the threat. This process is essential for immune defense, helping your body fight infections effectively.