For example, the law of gravity is just a definition of the value of an attractive force which exists between two material objects. It does not define the cause of the force.
Well, to be particular, there is no force - gravitation is a distortion of space-time, but ignoring that for a moment... The natural law is gravity. The 'Law of Gravity' is a product of science that describes that natural law in a way that we understand, but without the Law of Gravity there would still be gravity.
Nor does it define what brought the two objects to be where they are.
Similarly there are natural laws which we have attempted to define and quantify with scientific Laws and hypotheses, but those are our way of understanding those laws which existed before humanity came around. It is those laws that have led to reality, as we understand it, being as it is.
O.