B cell

B cells are a type of white blood cell that play a key role in the immune system. They recognize and bind to specific invaders like bacteria and viruses. Once activated, B cells produce antibodies—specialized proteins that target and mark these invaders for destruction by other immune cells. This process helps protect the body from infections and builds immunity. B cells also have the ability to remember past invaders, so they respond faster and more effectively if the same threat appears again in the future.