A high level look at the concepts of compilers, interpreters, byte codes and Just-in-Time compilation, as ways of converting our programs into executable programs or machine instructions processed by the CPU.
The first video provided a high level look at computer system architecture.
The second video introduced the concepts of the CPU or processor.
This video introduces the conversion of our high level programs into machine executable code. Note that this video does not cover specifically how App Inventor blocks code is converted into an executable program.
The fourth video, relying on the information covered in the first 3 videos, will explain the ideas behind the SPECTRE exploit.