They don't exactly (unless you mean under power). A fore-and-aft rigged sailboat can sail as close as about 25 degrees into the wind (although when one does this, the Course Over Ground (COG) usually drifts downwind some).
The principles in place are the same that apply to a wing on an airplane. The wind passing over the windward surface of a sail has a longer distance to cover than wind passing behind the sail (which would describe roughly a straight line). Therefore, a low pressure zone is created near the front or upwind surface of the sail, and force is applied in that direction. This effect is called "lift".
Sailboats are powered by wind.
The get pushed by the wind.The get pushed by the wind.The get pushed by the wind.The get pushed by the wind.
places along the equator were there is no wind so sailboats can't move till the wind shifts
when there is a wind
By controlling its flow across the sails: If the boat is light enough, it WILL move faster across the water than the wind does.
They are powerless without wind...
sailboats are propelled by the wind
the wind helps the sailboat go
Windmill and sailboats
Yes... some of us refer to it as "harnessing" the wind....
How about 4000BC when Sumerians build sailboats?
Wind can be used to pump water from wells AND/OR generate electricity. Wind-powered boats or ships are called SAILboats. Hot air balloons are driven by the wind. There are even wind turbine powered sailboats. Sailplanes (gliders) soar AND glide on the wind. Plus, we breathe it. Without aspiration, plants and tress would suffocate. In many cases, this requires wind movement.