Cytotoxic T-lymphocytes, also known as CD8+ T cells, are a type of white blood cell that plays 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 target cells, allowing them to target and eliminate threats effectively. Once activated, cytotoxic T-lymphocytes release proteins that induce cell death in their targets. This process is essential for controlling infections and preventing the spread of diseases. Their activity is vital for maintaining the body's overall health and defense against various pathogens and tumors.