Adverbs are words that modify verbs, adjectives, or other adverbs. They provide more information about how, when, where, or to what extent something happens. Adverbs can be used to make your writing more vivid and descriptive. For example, in the sentence "She quickly ran to the store," the adverb "quickly" describes how she ran. You can form adverbs by adding "ly" to adjectives, like "quick" becomes "quickly," but some adverbs don't follow this pattern, so it's important to learn them individually.