「今日」(kyou) means "today." It's used to refer to the current day. You can use it with verbs to talk about what you are doing or what is happening on this particular day. Example: 「今日、休みです」(Kyou, yasumi desu) means "Today is a holiday/I am off today."

「今日」（きょう）は「今日」という意味です。現在の日にちを表す時に使います。例：「今日、休みです」。