Is buying a domain a one time purchase?

Related questions

1. What is the difference between www and no www?
2. Do I need the www in my URL?
3. Is XYZ Rank same as level?
4. What does XYZ mean in Yugioh?
5. Is there any free domain?
6. Where should I buy my domain name?
7. Does it matter where you buy your domain?
8. Is www part of the domain name?
9. How many Pokemon does Ash have in XYZ?
10. What does XYZ mean in Pokemon?

Tags

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4. #hosting
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19. #forever
20. #registrar