A note is a brief written message or reminder. You might leave a note on the kitchen table telling your mom you went to your friend's house, or write yourself a note to remember to return a library book. Notes help us capture thoughts quickly without writing long explanations.

In school, taking notes means writing down important information while your teacher talks or while you read. Good notes help you remember key facts and ideas later when studying for a test. Some students take notes in neat outlines, others jot down phrases and drawings that make sense to them. Either way works as long as the notes help you learn.

In music, a note is a single sound with a specific pitch and length. When you play middle C on a piano, you're playing one note. Sheet music uses symbols to show which notes to play and for how long. Musicians read these notes the way you read words on a page.

The word also means noticing or paying attention to something: “Did you note how quiet the room got when the principal walked in?” When someone asks you to take note of something, they want you to pay special attention and remember it.

Finally, a note can mean a quality or tone in someone's voice or in a situation, like when there's a note of sadness in your friend's voice, or a note of excitement in the air before a big game.