Definition
This idiom indicates that the appearance of something is exactly how it is, with nothing hidden or deceptive.
The decor of this restaurant is very simple, without excessive embellishment; what you see is what you get.
He has always been a straightforward person; what you see is what you get. You don't need to worry about him hiding anything.
I have already checked the condition of this used car; what you see is what you get. There are no hidden problems.