The stratosphere is the second layer of Earth's atmosphere, located above the troposphere and below the mesosphere. It extends from about 10 kilometers (6 miles) to 50 kilometers (31 miles) above the Earth's surface. This layer is important because it contains the ozone layer, which absorbs and protects us from harmful ultraviolet (UV) radiation from the sun. In the stratosphere, the temperature increases with altitude, unlike in the troposphere where it decreases. This temperature inversion helps create stable air conditions, making it a preferred region for commercial airplanes to fly. The stratosphere plays a crucial role in weather patterns and climate, influencing how air moves around the planet.