This tab shows a simplified version of Beethoven's Fur Elise. 
It's used to demonstrate how to use your thumb for playing. The 
numbers underneath each note indicate the finger you should 
use to pluck the string. 0 is your thumb, 1 indicates your index 
finger and so on. This is just a guide and depends on your playing 
style however you should attempt to use your thumb in the places 
shown otherwise it would defeat the point of the exercise. When 
using normal alternate finger picking to play, the thumb is 
usually used on the bottom—most (thickest) string of whatever 
you're currently playing with your other fingers on higher 
strings. To demonstrate this, a zero in brackets, (0), will 
be used alongside the normal finger number to show that you could 
use your thumb here. It is all down to how you feel comfortable 
playing however.

If you are a pure beginner it is highly recommended you view the 
video (a link is at the bottom) to see clearly how to play it. If 
you are more experienced just treat this exercise as a way of 
getting used to using your thumb (and maybe 3rd finger) for playing.

G —9—8—9—8—9———7——————————————————————————————————————————
D ———————————9———10—7———————7—9———7—9—10——————————————————
A ————————————————————————7—————7—————————————————————————
E ——————————————————————9—————————————————————————————————
   2 1 2 1 2 2 1  3 2   0 1 1 2 1 1 2  3
                               (0)


G —9—8—9—8—9———7——————————————————————————————————————————
D ———————————9———10—7———————7—9———10—9—7——————————————————
A ————————————————————————7—————7—————————————————————————
E ——————————————————————9—————————————————————————————————
   2 1 2 1 2 2 1  3 2   0 1 1 2 1  2 1 2
                               (0)


G ——————7—9———9—10—9—7———7—9—7—————————7—————————————————7—
D —9—10————————————————————————10———10———10—9———9———10—————
A —————————————————————————————————————————————————————————
E —————————————————————————————————————————————————————————
   1  2 1 2   1  2 1 1   1 2 1  2    2 1  2 1   1    2   1

To see this performed and to get an idea of the fingering to use, 
go here: http://www.youtube.com/watch?v=0waKtgglGUg