An adverb's a part of speech. It's any word that modifies any other part of language: verbs, adjectives (including numbers), clauses, sentences and other adverbs, except for nouns; modifiers of nouns are primarily determiners and adjectives. Adverbs typically answer questions such as how?" (or "in what way?), when?, where?, why? and to what extent?. In English, they often end in -ly. When they answer 'how' it's usually in what way. When they answer 'when' it's usually a date or a word such as… (More on Adverb)