First I am going to explain why I am writing this. As an outspoken and social person I come a cross allot of people with different backgrounds, ethnicity or religious beliefs who don't understand what theory of evolution is. Unfortunately people in allot of topics without having enough information make up their mind. In this article I am going to try to explain theory of evolution as easy as possible.
I am going to begin with the definition of the words. The scientific definition of the word theory is an explanation or model based on observation, experimentation, and reasoning, which has been tested and confirmed as a general principle helping to explain and predict natural phenomena, or explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Scientific theories are the most reliable, rigorous, and comprehensive form of scientific knowledge. This is significantly different from the word "theory" in common usage, which implies that something is unproven or speculative. In a easier term scientific theory explains all the facts and hypothesis of the natural phenomena.
Just like the word fly that has two meanings and one is flying and the other is insect. Theory has two meanings as well. Now this should clear out the problem with the argument of evolution is just a theory not a fact. If you are still not convinced look at the other scientific theories like the theory of gravity and one of the best examples of how doubtful the theory of gravity could be is the picture bellow.
Now we can move on to the evolution subject. The proposal that one type of animal could descend from an animal of another type goes back to some of the first pre-Socratic Greek philosophers, such as Anaximander and Empedocles. Charles Robert Darwin an English naturalist established all species of life have descended over time from common ancestors, and proposed the scientific theory that this branching pattern of evolution resulted from a process that he called natural selection, and he published his theory with compelling evidence for evolution in his 1859 book On the Origin of Species.
Another problem with general understanding of the society about theory of evolution is the misconception of the scientist are divided about this subject. The fact is no scientist who is an expert in that field thinks it is wrong. We have to understand there are allot of people trying to prove theory of evolution wrong, and for their goal they might ask a scientist in another field who happened to be on their side and I an very glad there are not that many of them to say the evolution is wrong, but he/she is not credible to state such a matter due to his lack of understanding in the subject matter. Just like if an evolutionary biologist say theory of gravity is wrong the science community would laugh at him. The scientific evidence or facts are overwhelming and there is not a single scientific paper against it.