"When" refers to the specific time something occurs or is scheduled to happen. It can indicate a particular moment, day, or period, helping to clarify the timing of events. For example, asking "When is the meeting?" seeks to determine the exact time and date of that event. In everyday language, "when" is often used in questions and statements to establish a timeline. It can relate to past, present, or future events, such as "When did you arrive?" or "When will the project be completed?" Understanding "when" is essential for effective communication and planning.