I watch a lot of food programs and the chefs would advocate using soy sauce instead of salt for making a dish salty. The question is what makes soy sauce salty? Does it actually contain salt?
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Yes, salt is one of the primary ingredients of soy sauce, along with soybeans, wheat, and water. It's used as an ingredient or condiment to add saltiness, just like plain salt generally is in Western cuisines. (Soy sauce additionally adds umami flavor.)