The common name for sodium chloride. Commercial salt is marketed in many grades, depending chiefly on the size of the grain.
Industrial salt is rock salt, while the bulk of the domestic salt is evaporated sea salt.
Rock salt is mined from natural deposits of salt. Often, water is pumped into specially drilled wells to dissolve the rock-salt deposits. The resulting salt is a white color. Some are quite large in size while others are flour like. Some grains are round in shape while others are flat.