A 15-minute city is a city that is designed to make it easy for people to access what they need in 15 minutes or less. That means that within 15 minutes you can walk or bike to work, buy groceries, get to a park or school, and access other essentials. It helps reduce the need for transportation like cars, buses, and trains, so it can be better for the environment if people can live, work, and play all in their own neighborhood.