Antibody-antigen recognition is a crucial part of the immune response. Antibodies are proteins produced by B cells that specifically bind to antigens, which are foreign substances like bacteria or viruses. This binding helps the immune system identify and neutralize harmful invaders. When an antibody encounters an antigen, it attaches to it through a precise fit, much like a key fitting into a lock. This interaction can trigger various immune responses, including the activation of other immune cells and the destruction of the pathogen. This process is essential for maintaining the body's defense against infections.