I suspect you are looking for lavash. Lots of ways to make it. Generally no yeast or sourdough though you can use starter that is a couple of days old and very sour (and not too alive) to add flavor. It is flat and thin but flexible. Some people make it so that it is crisp enough to snap when it comes out of the oven, but if you leave it out for a while it will become flexible again.
I suspect you are looking for lavash. Lots of ways to make it. Generally no yeast or sourdough though you can use starter that is a couple of days old and very sour (and not too alive) to add flavor. It is flat and thin but flexible. Some people make it so that it is crisp enough to snap when it comes out of the oven, but if you leave it out for a while it will become flexible again.