there's a certain yarn thing that u can make with your hand and when your down it kinda looks like a rope.

Question

and if you pull the ends it tightens and when you let go it opens up so theres space in the middle whats it called?

Answer 1

I believe it is done with what is called "finger knitting" or spool knitting and turns out similar to the "Chinese finger traps" we used to get as consolation prizes at the carnival. It can be done with double pointed needles too with only a few stitches cast on and knit in a circle.