Here's how it works:
* Adjective: Describes a noun.
* Adverb: Describes how, when, where, or to what extent something happens.
Think of it like this:
* Adjectives: "Big" dog, "red" car, "happy" child
* Adverbs: The dog barked "loudly", the car drove "quickly", the child laughed "joyfully"
So, an adverb modifies a verb, adjective, or another adverb, giving you a more detailed picture.