T Cells are a type of white blood cell that play a crucial role in the immune system. They are produced in the bone marrow and mature in the thymus, which is where they get their name. T Cells help the body recognize and fight off infections, viruses, and even cancer cells by identifying foreign substances. There are different types of T Cells, including Helper T Cells and Cytotoxic T Cells. Helper T Cells assist other immune cells in responding to pathogens, while Cytotoxic T Cells directly attack and destroy infected or cancerous cells. Together, they work to maintain the body's defense against diseases.