Common salt or sodium chloride (NaCl) is generally produced from sea water or ocean water. The other source is rock salt. Human beings have evaporated ocean water in large trenches for a very very long time and have obtained salts after water has been evaporated by solar energy.
Similar methods are used currently as well, in which sea water is stored in shallow trenches for a long time and salt is obtained after water has been evaporated. This salt is not yet fit enough for food processing and hence is further purified. In this process, dried salt is washed with a saturated solution of brine (NaCl in water). During this step, salt moves out of the aqueous phase, while the impurities are mixed with the aqueous phase. By repeating this process multiple times, we can obtain salt of very high purity.
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