Sea salt is salt produced from evaporated seawater, minimally processed to retain trace minerals like magnesium, potassium, and calcium, giving it subtle flavor variations and colors compared to refined table salt, but both are primarily sodium chloride, so moderation is key for health. Used for seasoning, food preservation (fermentation), skincare (baths, scrubs), and cosmetics, it's valued for its natural taste, potential mineral benefits, and role in electrolyte balance.