non orientable shapes, what does that term mean and how it affects the shape being non orientable

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Title says it all, mobius strips, Kline bottles etc. I understand they have no start and finish but what does orientable and non orientable mean and why do they exist

In:

It means you can start at one point, walk on the shape, and get back to that same point finding yourself upside down. This wouldn’t be possible on a sphere (which is orientable).