A theory is an idea that tries to explain facts or events around us. People use theories to understand how things happen or work.
This is a good theory about stars.
Her theory helps us understand plants.
In science, a theory is a well-organized explanation based on many facts. It helps scientists understand how the world or universe works.
Einstein’s theory changed physics.
The theory of gravity explains falling.
Theory can mean an idea about the best way to do things. It is often about plans or methods in subjects like education or business.
His theory about teaching is clear.
The theory was not easy to use.
In math or philosophy, a theory is a set of connected ideas or rules. It helps experts study and explain specific areas in a clear way.
Set theory is part of math.
He studies theory in philosophy.
Sometimes theory means an idea or guess that needs to be checked. It is used before people have full proof or facts.
His theory needs more proof.
The theory needs to be tested.
Theory can be an idea that people use to think or talk about things without a physical example. It helps explain feelings, values, or ideas.
Justice is a hard theory to explain.
The theory of love is often written about.
