Using the wind to move your boat is 
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easier than rowing, but there is 
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one small problem; you can 
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not sail straight into the wind. 
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Sailing upwind is similar to 
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driving a car up a mountain, 
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you have to zigzag your 
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boat to sail upwind.
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In sailing this zigzagging is 
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called tacking, because you 
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perform a series of tacks 
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(hairpin turns into the wind). 
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The ability to sail upwind quickly 
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is a sign of a good skipper, & most 
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sailboat races include an upwind leg.