What is swap in and swap out in Linux?

Related questions

1. What is a VM swap file?
2. Do you need Linux swap?
3. How big should swap file be?
4. How much swap do I need?
5. What is swap usage?
6. What is the swap space in the disk used for?
7. How much swap space should I have?
8. Can I delete private var VM swapfile?
9. What is swap memory?
10. What is swap area Ubuntu?

Tags

1. #linux
2. #physical
3. #virtual
4. #cases
5. #present
6. #create
7. #pages
8. #machine
9. #system
10. #option
11. #inactive
12. #running
13. #moved
14. #memory
15. #space
16. #amount
17. #partition