Why you wear hijab?

Ring a bell? Have you ever ask yourself why you wear hijab? As a fashion? A rules?
Actually i was surfing for spring fashion for muslimah..since my sister will organize and involve in fashion day...so i saw so many hijab fashions...very nice...but some is just a fashion..
but what was interested me, wearing hijab during Olympic game..that's show muslimah also can participate in sports wearing a proper attire...
It's shows that nothing can stop you to success....Nothing at all as long you have determination...