What is the Antarctic Circle?

The Antarctic Circle is an imaginary line located at 66.5° South latitude. It marks the northernmost point of the Antarctic region, where, during the summer solstice, the sun does not set for 24 hours, a phenomenon called the Midnight Sun. In winter, the sun does not rise for 24 hours, resulting in complete darkness. The Antarctic Circle divides the Earth into the Antarctic region, which includes the South Pole, and the rest of the Southern Hemisphere. This circle plays a significant role in understanding the Earth’s polar climates and extreme weather conditions.

This question related to Chapter 1 Social Science Class 6th NCERT.
From the Chapter 1. Locating Places on the Earth.
Give answer according to your understanding.