What is the Oort limit?

I'm curious, could you please explain to me what the Oort limit is? I've heard it mentioned in discussions about astronomy and the solar system, but I'm not entirely sure what it represents. Is it a boundary that defines the edge of our solar system? Or does it have some other significance in the broader context of the universe? I'm eager to gain a better understanding of this concept and how it relates to our understanding of the cosmos.