What is unusual about Sahara? Why is it an important part of North Africa's landscape?

Question

We're talking about the Sahara Desert, and only in North Africa's region, so dont talk sh*t about other stuff, thank u.

Answer 1

'The Sahara  is the world's largest hot desert, and second largest desert after Antarctica. At over 9,000,000 km² (3,500,000 sq mi), it is almost as large as the United States, and is larger than the 48 contiguous states. The Sahara defines the borders of North Africa and has an intermittent history that may go back as much as 2.5 million years. The name is an English rendition of as-á¹£aḥrā, the Arabic word for "desert"'