What is the name of the desert that covers parts of Kazakhstan and Uzbekistan?

What is the name of the desert that covers parts of South Africa, Namibia, and Botswana? In which continent is the Arabian Desert located? Which desert spans across several countries in North Africa? Which desert is home to the highest population density? What is the largest desert in the world? Which desert is home to the world's highest sand dunes? In which country is the Karakum Desert located? In which country is the Great Victoria Desert located?