String Theory is potentially a unified theory of Everything

String theory is a broad and varied subject that attempts to address a number of deep questions of fundamental physics. String theory has been applied to a variety of problems in black hole physics, early universe cosmology, nuclear physics, and condensed matter physics, and it has stimulated a number of major developments in pure mathematics. Because string theory potentially provides a unified description of gravity and particle physics, it is a candidate for a theory of everything, a self-contained mathematical model that describes all fundamental forces and forms of matter.

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String theory - Wikipedia, the free encyclopedia

If you are trying to figure out what a theory is it goes something like this:

If you had talked to John last night and he said that he might come over tomorrow then that would be a hypothesis that John was coming over tomorrow.

If John then called you the next day and said, "I'm coming over now!"

Then that might be a theory that John was coming over.

Then if John arrived at your place then that would be a law that John had come over to  your place on that day.

So, you have all things in life being classified then as hypotheses, Theories and laws.

I find it useful to classify all things this way in life because you never know what hypotheses are eventually going to become theories and then you also don't always know which of your theories will become Laws (at least to you).

So, this way you don't just throw away information that might be useful to you in the future. Because no matter how outlandish something may seem to you there may be an element of truth to it in the end. 

And you also have Francis Bacon (the illegitimate son) of Queen Elizabeth I of England to thank for the Scientific method of classifying all things as hypotheses, theories and laws and some people call him now Saint Germain.

 Francis Bacon born 22 January 1561