A "hook" is a captivating element in writing, music, or storytelling that grabs the audience's attention right from the start. In literature, a hook can be an intriguing opening line or a surprising twist that makes readers want to know more. In songs, it often refers to a catchy melody or lyric that sticks in your mind, encouraging you to sing along. In marketing, hooks are used to draw customers in, often through eye-catching advertisements or compelling slogans. For example, a clever tagline for a product like Nike can create a memorable association, making people more likely to remember and choose that brand over others.