CD8+ T cells are a type of immune cell that play a crucial role in the body's defense against infections and cancer. They are also known as cytotoxic T cells because they can directly kill infected or cancerous cells. These cells recognize specific antigens presented by infected or abnormal cells, allowing them to target and eliminate threats effectively. When CD8+ T cells are activated, they proliferate and release substances that induce cell death in their targets. This process is essential for controlling viral infections and preventing the spread of tumors. Their ability to remember past infections also helps the immune system respond more rapidly to future threats.