Interrogative words are words used to ask questions. They help gather information and include words like who, what, where, when, why, and how. Each word serves a specific purpose, such as asking about a person, a thing, a place, a time, a reason, or a manner. These words are essential in both spoken and written communication. For example, you might ask, "Where is the library?" or "What is your favorite color?" Using interrogative words allows for clear and effective inquiries, making it easier to obtain the information you need.