Here's why:

* Adaptive Immune System: This system is characterized by its ability to specifically recognize and target pathogens. It remembers previous encounters with pathogens and mounts a more rapid and effective response upon re-exposure.

* T cells: These cells are a key component of the adaptive immune system. They are responsible for:

* Cell-mediated immunity: Directly attacking infected cells.

* Helper function: Stimulating other immune cells like B cells to produce antibodies.

* Immune regulation: Controlling and regulating the immune response to prevent excessive inflammation and autoimmune reactions.

Let me know if you'd like more details about T cells or the adaptive immune system!