Here's a breakdown:

* Natural Selection: The process where organisms with traits better suited to their environment survive and reproduce more successfully, passing those advantageous traits to their offspring.

* Adaptation: A trait that increases an organism's chances of survival and reproduction in a specific environment.

Think of it this way:

1. Variation: Within any population, there's natural variation in traits. Some giraffes have slightly longer necks than others.

2. Selection: If there's a shortage of food in the tall trees, giraffes with slightly longer necks can reach the leaves, survive, and reproduce.

3. Inheritance: The offspring of those long-necked giraffes are also likely to have longer necks, passing on the advantageous trait.

Over many generations, this leads to the evolution of a population with longer necks, an adaptation that makes them better suited to their environment.

In short, natural selection drives the evolution of adaptations that help organisms survive and thrive in their specific environments.