Cytotoxic T-cells, also known as CD8+ T-cells, are a type of white blood cell that play a crucial role in the immune system. They are responsible for identifying and destroying infected or cancerous cells. These cells recognize specific antigens presented on the surface of infected cells, allowing them to target and eliminate threats effectively. Once activated, cytotoxic T-cells release proteins that induce apoptosis, or programmed cell death, in the infected cells. This process helps to prevent the spread of infection and maintain the body's overall health. Their ability to remember past infections also contributes to long-term immunity.