Why does stirring your spoon in a cup dissolve salt or sugar?
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The previous two answers are wrong. You don’t stir to heat the drink.
I’ll use sugar here, it’s the same for salt: If you just put sugar into the drink then it’ll sit in a pile at the bottom and start dissolving into the surrounding water. You quickly get a region with a lot of dissolved sugar molecules in the water around the solid sugar, some of these molecules stick to the sugar grains again: The process slows down while most of the drink doesn’t have any sugar yet. Stirring mixes the sugar-loaded water with the rest and also distributes the sugar grains better in the drink.
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