Why swap space is used in Linux?

Related questions

1. What is swap usage?
2. What will happen if I delete pagefile sys?
3. What is swap area Ubuntu?
4. Can I delete swapfile?
5. How much swap space should I have?
6. Can I delete private var VM swapfile?
7. What is the swap space in the disk used for?
8. What is swap memory?
9. How big should swap file be?
10. What happens when swap memory is full?

Tags

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