What is a knowledge-based economy?

What are the main features/attributes of a knowledge-based economy? 3. Why do countries want to transfer to a knowledge-based economy? In particular, why does Saudi Arabia want to become a knowledge-based economy? 4. How is Saudi Arabia transforming and planning to transform into a knowledge-based economy? In particular, discuss the elements of Vision 2030 and the National Transformation Program 2020, which are related to the transformation into a knowledge-based economy.