The Earth rotates on its axis, and takes an entire day (24 hours) to makea complete turn. At any time half of the Earth faces the sun, which has day. The other half of the Earth faces away from the sun and receives no light. When that part of the Earth is not receiving any sunlight, there is nighttime, and darkness.
It’s also a bit more complicated than that. With an even distribution of stars, light should still reach us on the side away from the sun, but it doesn’t. This is called Olber’s paradox. For an in-depth explanation, see the link below.
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