The term "during" is a preposition used to indicate a specific time period in which an event occurs. It helps to clarify when something happens in relation to other events or actions. For example, one might say, "I read a book during the summer," meaning the reading took place within that season. In addition to time, "during" can also be used to describe events or activities that happen simultaneously. For instance, "She studied during the lecture" implies that the studying occurred at the same time as the lecture. This word is essential for providing context in both spoken and written communication.