Conjugation is the process of changing a verb form to express different grammatical categories such as tense, mood, voice, aspect, person, and number. For example, in English, the verb to be can be conjugated as "am," "is," or "are" depending on the subject and tense. This allows speakers to convey when an action occurs and who is performing it. In many languages, including Spanish and French, conjugation is more complex, with various endings added to the verb stem based on the subject. Understanding conjugation is essential for effective communication, as it helps clarify the meaning of sentences and indicates relationships between actions and subjects.