An "imperative" is a grammatical mood used to give commands, make requests, or offer invitations. It typically involves the base form of a verb and often omits the subject, as the subject is usually understood to be "you." For example, in the sentence "Close the door," the verb "close" is in the imperative form. In addition to its grammatical use, "imperative" can also refer to something that is essential or urgent. For instance, in business, it may describe actions that are crucial for success, such as meeting deadlines or improving customer satisfaction.