The Futur Antérieur is a French verb tense used to express an action that will have been completed before another future action occurs. It combines the future tense of the auxiliary verbs avoir or être with the past participle of the main verb. This tense is often used to indicate a sequence of events in the future. For example, in the sentence "Quand il arrivera, j'aurai fini mes devoirs," the phrase "j'aurai fini" shows that the action of finishing homework will be completed before the arrival of il. The Futur Antérieur helps clarify timelines in future scenarios.