In a narrow sense, industrial salt and edible salt are industrial sodium chloride and edible sodium chloride, which are purified and added with other elements beneficial to human body, such as iodized salt, which is added with iodine. Industrial salt depends on where it is used, and the purity requirements are different. A salt mine is a mine that produces salt.

If there is more salt in a broad sense, the chemical compounds of metal ions, ammonium radicals and acid radicals and nonmetallic ions are all called salts, some of which are edible and some are highly toxic, which is not what we call salt in our daily life.