Here's why:
* Adverbs primarily modify verbs, describing how, when, where, or to what extent an action is performed.
* Example: "He ran quickly." (modifies the verb "ran")
* Adverbs can also modify adjectives, describing the degree or intensity of the adjective.
* Example: "She is extremely beautiful." (modifies the adjective "beautiful")
Let me know if you have any other grammatical concepts you'd like to explore!