Or about how something works: Understanding is a relation between the knower and an object of understanding. Both comprehension and understanding can be used to talk about someone's ability to understand something.
Pete Hegseth’s War on Religious Freedom and the Constitution Bucks
Your understanding might be that your mother will always drive you to school if you miss the bus. He noted bond's apparent lack of. Understanding implies abilities and dispositions with respect to an object.
Understanding a concept means you get it.
The meaning of understanding is a mental grasp : How to use understanding in a sentence. Knowledge about a subject, situation, etc. Comprehension usually used with of.