Byzantine dance is like a super fancy dance that people used to do a long time ago in a place called the Byzantine Empire (which is now mostly in Greece and Turkey).
It's kind of like the dancing you might see at a big wedding or celebration, but with lots of special moves, costumes, and important meaning behind each step. Some dances even tell stories or teach people about their history and culture!
People who do Byzantine dance have to be very talented and practice a lot, because the moves are complex and require lots of grace and strength. They might use special instruments like drums or flutes to keep the beat, and wear pretty clothes with lots of shiny jewelry.
All in all, it's a really cool and special dance that is loved by people all over the world who appreciate its beauty and cultural significance!