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Innate immune responses are those that rely on cells that require no additional training or programming. These cells include: neutrophils, monocytes, phagocytes, natural killer (NK) cells, and a set of proteins known as the complement proteins.
Innate responses to infection occur rapidly and reliably. Even infants have excellent innate immune responses.
Adaptive immune responses involve T cells and B cells
It requires training or sensitizing to learn how to respond to antigens .
The advantages of adaptive responses are their long-lived memories and the ability to adapt to new types of infections by producing memory cells. The bone marrow and thymus represent training grounds for two cells of the adaptive immune system (B cells and T cells, respectively)