Unsalted butter contains no added salt. Think of it as butter in its purest form.
As a result, it has a shorter shelf life than salted butter (and many cooks will also tell you that it has a fresher taste).
In terms of flavor, unsalted butter has a more pronounced mellow sweetness than salted butter.
What is unsalted butter used for?
Most commonly called for in baking recipes. It has a very neutral, creamy flavor—a great base for many baked goods. In baking, precise measurements are key for achieving the right flavor and texture. This even extends to small amounts of ingredients like salt.
According to Dr Tejender Kaur Sarna, Nutritionist and Lifestyle Coach, this butter is better than salted butter as the latter is loaded with salt, which might increase your overall sodium intake when eaten in excess.