Occam’s Razor helps us choose between two or more explanations of a problem. It provides a useful mental model for problem-solving. A razor is a principle or rule of thumb that allows one to eliminate unlike explanations for a phenomenon, or avoid unnecessary actions.
One popular definition of Occam’s Razor is:
If we face two possible explanations which make the same predictions, the one based on the least number of unproven assumptions is preferable, until more evidence comes along.
This mental model help us look for explanations that are least complicated. It does not mean explanation has to be easy so that anyone can grasp it with limited effort but it means explanation can be logically reasoned without making too many assumptions.