B-Cells are a type of white blood cell that play a crucial role in the immune system. They are responsible for producing antibodies, which are proteins that help identify and neutralize harmful invaders like bacteria and viruses. When B-Cells encounter these pathogens, they can quickly multiply and create specific antibodies tailored to fight off the infection. Once activated, some B-Cells become memory cells, which remember the specific invader. This allows the immune system to respond more rapidly if the same pathogen attacks again in the future. Overall, B-Cells are essential for maintaining our body's defense against diseases.