Yogurt and curd are diary products.

yogurt , though , results from milk fermentation ( converting a substance into acid under anaerobic conditions ) whereas curdling or coagulation is when milk sours or is treated with either enzymes or edible acids like lemon juice.

curd is a coagulated liquid resembling milk curd or used to make cheese.

lactose , the sugar in milk becomes lactic acid when it ferments.lactic acid gives yogurt its distinct tangy flavor.yogurt's health benefits enhance its popularity.curd makers often employ the enzyme rennet , other bacteria or the acid vinegar.
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