Preference in android how that working

In preference there we can add sum advantages in his app .in Android   Application there are there is a very great and useful .that's by we can make in each and every apps any how 4 or 5 activity we can make ..that's very easy to make...
in preference there we have to store data ....
Example:-

first time we play a game and we make a score that is 10,000 and we stop that
again next day we play that game and then either our game will start from pose position or either restart and the score will store in internal memory

these are the thing these we can invert in preference

What is Preference:-
1:- Set user name
2:-Update stings
3:-Send Crash Report
4:- Sync Frequency
5:- User name
6:-Password