what is a theory and is evolution and big bang both theories?

A scientific theory is the framework for observations and facts. Theories may change, or the way that they are interpreted may change, but the facts themselves don’t change.

Yes, evolution and the Big Bang are both theories, along with gravity and the germ theory of disease. All of these theories are backed by evidence (facts) and observations made in the real world, and all have been able to make predictions about the nature of the universe. This is how, with a lot of work, a hypothesis can graduate and become a theory.

In science, a theory is something with tons of evidence and proven. Yes. Evolution and the Big Bang are both theories.

In popular parlance, a theory can be anything from a wild guess on up. In science, a theory is a well-verified explanation of observed facts, one that has been tested repeatedly and withstood all testing with no more than minor tweaking. Evolution is probably the soundest theory in science. The Big Bang is less well-tested.

Evolution is an observed fact. There is a theory about how it works, heavily supported by masses of facts.

Big bang is a scientific theory , supported by observed facts.

In Science a theory is a conceptual framework that organises and explains a body of empirical facts.

In Creationism, a "theory" seems to be mainly a perjorative term for any scientific result that conflicts with religious doctrine.

But I guess you've heard this before, Roy. You're probably not going to get it this time either. You're a JW, are you not? It seems like you're not allowed to acknowledge facts unless they appear in Watchtower's magazine.

Evolution is NOT a theory any more than gravity is a theory. What is a theory is HOW evolution takes place.

A theory is an idea made to explain something. The both of them are hypothesis because they are not both generally accepted to be true

A theory is an attempt to explain an observed phenomenon, or set of facts.

a theory is a highly tested and verified scientific description of real world events.

and yes they are both theories.

Because science uses the word "theory" for facts.