what is space?

The what is time thread got me thinking. I’ve always wondered what is space?

Best I can figure it’s what you get when you consider the x, y, and z lines (math def) and according to relativity it’s bendable. Which means it’s something, even though common sense says it’s the lack of something, because you can’t bend nothing. It foams on a quantum level with undefinedness, or at least unpredictable randomness , and motions contracts it, but what exactly is it?

The final frontier?

Well this question is boldly going nowhere that’s for sure.

Wonder what exactly is getting distorted by gravity for example.