A Post-it Note is a small piece of paper with a re-adherable strip of glue on the back, allowing it to stick to surfaces without leaving residue. They are typically used for jotting down quick notes, reminders, or messages. The notes come in various colors and sizes, making them versatile for different organizational needs. Invented by Spencer Silver and popularized by Art Fry in the 1980s, Post-it Notes have become a staple in offices, schools, and homes. Their ease of use and ability to be repositioned make them a practical tool for enhancing productivity and communication.