The T-cell response is a crucial part of the immune system that helps the body fight infections and diseases. T-cells, a type of white blood cell, recognize and respond to pathogens like viruses and bacteria. When they encounter an infected cell, they become activated and can directly kill the infected cells or help other immune cells. There are different types of T-cells, including helper T-cells and cytotoxic T-cells. Helper T-cells assist in coordinating the immune response, while cytotoxic T-cells target and destroy infected or cancerous cells. This response is essential for maintaining health and protecting the body from various threats.