Wind is when air is heated. And it creates wind.
When the sun warms up the air it cause wind.
A jet stream is a wind that gets faster and is hard to fly in but good to fly in when you and the jet stream are going the same way. Here are some examples.
Did you now that a jet stream is 5-7 miles in the atmosphere. And it goes west to east.
A jet stream is not a river and it is not the smoke that comes out of a plane. example:
These were the examples of wrong jet stream.
You can use instruments to see where the wind is going.
This is a windvane an instrument that measures wind.