Salt is produced through seawater evaporation and rock salt mining.
Solution mining involves digging a well deep into an underground salt deposit, pumping in water to dissolve the salt crystals, and then drawing the brine back up to the surface.
Salt can also be obtained by solar evaporation, in which seawater (or briny or ultra-saline lake water) is pumped into a series of large, shallow ponds and left to evaporate naturally.