A disc is a flat, round object, like a plate or a coin but usually thicker and sturdier. Frisbees are discs that sail through the air when you throw them with a snap of your wrist. The discs used in disc golf are similar but heavier, designed to fly farther and more accurately toward metal basket targets.

Your spine contains small cushioning discs between your vertebrae that act like shock absorbers when you run or jump. Before music streaming existed, people listened to compact discs (CDs), which stored songs digitally on shiny plastic discs that spun inside players.

A hard disk inside a computer stores all your files and programs on spinning magnetic discs, while older floppy disks were thin, flexible squares that held tiny amounts of data compared to today's standards.

Whether it's something you throw for fun, something that protects your back, or something that stores information, a disc's defining feature is its flat, circular shape.