An interrogative sentence is a type of sentence that asks a question. It typically begins with a question word, such as who, what, where, when, why, or how, or it may start with an auxiliary verb like is, are, can, or do. Interrogative sentences usually end with a question mark. These sentences are essential for communication, as they help gather information or clarify understanding. For example, the sentence “What time is the meeting?” is an interrogative sentence because it seeks specific information about the meeting's timing.