"Say" is a verb that means to express something in words. It can refer to speaking, writing, or communicating thoughts and ideas. People use "say" when they want to convey information, ask questions, or share feelings. In conversation, "say" is often used to report what someone else has expressed. For example, if John told Sarah about a movie, one might say, "John said the movie was great." This usage highlights the act of relaying information from one person to another, making it a fundamental part of communication.