Aerially...what does the jet stream mean?

A jet stream is a band of fast-flowing air currents, usually moving from west to east, at high altitudes in the atmosphere. It is formed due to temperature differences between air masses, and plays an important role in influencing weather patterns. It travels in a wave pattern and moves at extremely high speeds, driven by the temperature difference between the cold polar air in the north and the warmer tropical air in the south. The jet stream also affects weather patterns and the movement of atmospheric systems. Its location and strength can change, affecting short-term weather conditions and even long-term climate patterns.