Guild Wars 2

can someone tell me how “personal reward level increases” i have read the wiki but i dont understand it?

Everytime you do a fractal level equal or above your PRL (personal reward level), you’ll gain 1 level up to level 50.. For instance, if your PRL is 3, and you do a fractal 4, you’ll be level 4. You would level up by doing a 10 as well. However, a fractal 2 or 1 won’t change your level.