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The Arctic Circle is an imaginary line that marks the boundary of the Arctic region, located at approximately 66.5 degrees north latitude. It matters because it defines the area where the sun doesn't set during summer or rise during winter, and it's used to delineate the Arctic zone for scientific, political, and environmental purposes.
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The Arctic Circle, at roughly 66.5° north, is a commonly-accepted boundary of the Arctic waters and lands
The Arctic Circle is one of the two polar circles, and the northernmost of the five major circles of latitude. It is shown on maps of Earth at about 66° 34' N. Its southern counterpart is the Antarctic Circle.