T Helper Cells are a type of white blood cell that play a crucial role in the immune system. They help coordinate the body's response to infections by signaling other immune cells, such as B Cells and Cytotoxic T Cells, to take action. When a pathogen, like a virus or bacteria, enters the body, T Helper Cells recognize it and activate the immune response. These cells are essential for producing antibodies, which are proteins that target and neutralize pathogens. Without T Helper Cells, the immune system would struggle to mount an effective defense, making the body more vulnerable to infections and diseases.