Hello.  Have you ever watched Top Chef on Bravo? 
Hi no I haven't but I love cooking shows what is it about?
Its a cooking show featuring professional chefs who compete against each other.  They slowly get eliminated leaving the ones with the best cooking chops still standing!
Sounds great what kind of judges is on the show are they celebrity judges?
They are judged by other professional chefs and influential people in the food + wine industry.  Perhaps if your "IN" in the food world some of the judges might be psuedo D-list celebrities.  
I have to start watching the show do they do different cultures of food or baking I like watching the cooking shows where they bake the cakes etc.
Yes there are various culinary challenges.  A world class chef needs to be capable of more than just baking the best pasta dish!  They are challenged along different spectrums.