adsense/adwords/admob

1. Can anyone explain in plain simple layman terms
2. What is Ad sense?
3. What is Ad Mob?
4. What is Ad  Word?
5. Please send plain English layman terms all these
6. to sprout1932@gmail.com
7. or to goahead 1932@ gmail.com.
8. Which is better and why?
9. Which is better to write a blog?
10. or to take a sub-domain?
11. or to have an own web-site?
12. Which web-hosting site is good for EVER?
13. Which is better to Rent a house?
14. or lease a house or apartment?
15. or to own a house?
16. Which is better?
17. To own  an apartment?
18. to rent an apartment?
19. All these questions you at your own convenience
20. send the answers 
21. to sprout1932@gmail.com or
22. to go ahead1932@gmail.com