An "interrogative" is a grammatical term that refers to a type of sentence or phrase used to ask questions. Interrogative sentences typically begin with words like who, what, where, when, why, or how. They often require a response or information from the listener or reader. In English, interrogative sentences can be formed in various ways, including using auxiliary verbs. For example, "Are you coming to the party?" is an interrogative sentence that seeks confirmation. Interrogatives play a crucial role in communication, helping to gather information and clarify understanding.