Why swap is used in Linux?

Related questions

1. What is the purpose of the fstab file?
2. What is Linux and its advantages and disadvantages?
3. What are the types of file system?
4. Why is swapping needed?
5. What is root squash in NFS?
6. What is meant by Linux operating system?
7. What is Relatime fstab?
8. What is Suid in Linux?
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Tags

1. #filesystem
2. #dedicated
3. #amount
4. #virtual
5. #increase
6. #partitions
7. #available
8. #logical
9. #volume
10. #regular
11. #space
12. #memory
13. #linux