What is Earth rotation?

Answer 1

The rotation of the Earth is the Earth spinning on its axis, the pole extending from north to south, once every 23 hours 56 minutes and 4 seconds, roughly.

Revolution is the word describing earth's yearly orbit around the sun.

There are several implications of the Earth's rottation, for example: days and nights, timezones, different length of the daytime during the year (it's because rotation, revolution and axial tilt of the Earth). You can observe Earth's rotation, solar time changing, seasonal Earth's time changing etc. on Earth Time Clock (see: related links)

Answer 2

the rotation of the earth is causing day time and night time