Post-It Notes are small pieces of paper with a re-adherable strip of glue on the back, allowing them to stick to surfaces without leaving residue. They come in various colors and sizes, making them useful for organizing thoughts, reminders, and messages. Invented by Arthur Fry and Spencer Silver at 3M in the late 1970s, these notes have become a staple in offices and homes. These notes are often used for jotting down quick ideas, creating to-do lists, or marking important pages in books. Their convenience and versatility have made them popular tools for students, professionals, and anyone needing a simple way to communicate or remember tasks.