Utility is the usefulness or practical value of something. A multi-tool knife has high utility because it can do many different jobs: cutting, opening bottles, tightening screws. A bicycle has utility as transportation. When you ask “What's the utility of learning fractions?” you're really asking “How is this useful in real life?”

The word often appears when people compare options or make decisions. Engineers design products with utility in mind, making sure they actually solve problems people have. A fancy gadget might look cool but have little utility if it doesn't do anything helpful. Your parents might choose a reliable car over a flashy one because of its greater utility for getting the family where they need to go.

In everyday conversation, something described as having utilitarian design is plain and practical rather than decorative. Utilitarian objects focus on function over beauty: think sturdy work boots instead of dress shoes, or a simple metal water bottle instead of an ornate glass pitcher.

The word also has a specific meaning in economics, where utility measures how much satisfaction or benefit someone gets from using something. Economists study utility to understand why people make the choices they do, like why you might trade your dessert for extra recess time instead.