Teppanyaki is a way to serve dishes which are grilled on an iron plate by chefs usually in front of diners. Cooked foodstuffs are meat, seafood, vegetables, noodles and so on.  

Other than Teppanyaki restaurants, in Okonomiyaki restaurants we enjoy eating dishes more casually in that we cook Okonomiyaki, Monjyayaki, fried noodles and so on by ourselves. 
However, that teppanyaki restaurant in the photo serves nice combination meal mainly including Wagyu beef steak at reasonable prices so it is a good choice for a treat.

The restaurant is an old-establised one in Tokyo. If you like, I will lead the way.