Verbs are action words that express an action (run, jump, eat), occurrence (happen, occur), or state of being (is, are, am). They form the backbone of sentences, indicating what the subject is doing, experiencing, or being. Verbs can be conjugated to reflect tense (past, present, future), mood (indicative, imperative, subjunctive), and aspect (simple, progressive, perfect). Understanding verbs is essential for constructing meaningful sentences and conveying precise information in writing and speech.