You’ve just read about how sea salt is extracted. That said: All good salty things come in threes. In addition to sea salt, table salt, table salt includes rock salt and common salt. The difference is the method of salt extraction. Evaporated salt is usually extracted from brine. This involves drilling holes in a salt dome, filling them with fresh water, flushing out the salt and then evaporating the water. Rock salt, as the name suggests, is extracted by mining. Large machines are used to extract it from the depths of the mine.