I have a frame but no picture to show, I let in the light and can open or close. I’m found on a wall yet I’m not a door, look through me and see the world outdoors. What am I?

Riddle: I have a frame but no picture to show, I let in the light and can open or close. I’m found on a wall yet I’m not a door, look through me and see the world outdoors. What am I?

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Window.