system
Given the following post, respond as if you're commenting on Reddit:
human
What causes wind?

I checked out the Wikipedia article but require a little more extensive layman's/five year old explanation. I am curious!
gpt
Basically heat rises. When air gets hot it expands. When things expand they get less dense. Less dense means it has less mass for a given volume. When you are less dense than the stuff around you will float or rise. 

What does any of that have to do with wind? Well, the Sun heats the Earth and the hot Earth then warms the air right next to the Earth's surface. The warm air expands and then rises. As the warm air rises the near by air comes rushing in to feel the empty space. That rushing air is wind.

That is really over simplified, but it gives you a start. Do not read any more if you are happy with the explanation so far and do not want to go down the rabbit hole any more.

Also related is the fact that the equator gets more direct sun than the poles so the air near the equator is heated more than the air near the poles. that means the air near the equator will rise up more than the air near the poles. 

This will cause a circulation of air rising up from the equator and flowing toward the poles, with the low cooler air from the poles will move toward the equator to fill the gap left by the rising air.

Now mix in the fact that the earth has a "right hand" rotation and the air will bend toward the west as it moves toward the poles, this will cause a counter clockwise rotation in the north and clock wise rotation in the south.

Now also figure that the air over water heats differently than air over land and all kinds of crazy weather patterns can emerge. 

You can also explain why there seem to be desserts on land the same distance from the equator in both directions from the above circulations (at about 30 degrees). 

tl;dr Heat rises, cool air rushes in.