Why is virtual memory called virtual?

Related questions

1. What is Caddr_t?
2. What does MMAP return?
3. What is MMAP used for?
4. What does it mean to map a file?
5. How is mapping done in virtual memory?
6. What is the main disadvantage of virtual memory?
7. Does MMAP allocate memory?
8. What is offset MMAP?
9. Is malloc a system call?
10. Can virtual memory replace RAM?

Tags

1. #because
2. #allows
3. #protection
4. #virtual
5. #physical
6. #second
7. #memory
8. #emulate
9. #translated
10. #actually
11. #first
12. #section
13. #extend
14. #computer
15. #address
16. #called
17. #using
18. #extra