Adverbs are words that modify verbs, adjectives, or other adverbs. They typically answer questions about manner, place, time, frequency, or degree. Many adverbs are formed by adding -ly to an adjective. Common types of adverbs include adverbs of manner, which describe how something is done; adverbs of place, which specify a location; adverbs of time, which indicate when or how often something occurs; and adverbs of degree, which specify extent. Adverbs can appear in different positions within a sentence, most commonly at the beginning, middle, or end, depending on the specific adverb type and what it modifies.