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What is a pickle? A pickle, at its most broad and basic, is just a vegetable that has been made sour. Pickling refers to the act of souring (or acidifying) something (usually vegetables, but sometimes fruits, eggs and even meats).
Good article. Just one minor correction of fact. The term sour mash has nothing to do with any sour taste of the recycled mash. It gets its name from the fact that the process was developed based on methods used for making sourdough bread. Sourdough bread follows a similar method of using a prefermented starter with the new dough. Sourdough gets it's name from the flavor of the final product, but sour mash just gets it's name from copying the process from the other. The starter mash that is used in the sour mash process can actually be quite sweet sometimes.