The future perfect tense is a verb tense used to express an action that will be completed before some other point in the future. It is formed by combining the auxiliary verb “will have” with the past participle of the main verb. This tense is used to describe an action that will be finished or completed at a specific point in the future, often with a time expression such as “by the time,” “before,” or “by next summer” to indicate the point at which the action will be completed.