What is the difference btw soap and detergent?

1.	What is the difference btw soap and detergent?
Answer» Soap??made from sodium or potassium salts...it is biodegradable. ....not work in hard water.....form scum in hard water..DETERGENT ???made from sulphate salts ...not biodegradable. ..also effective in hard water...do not form scum in hard water...

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