Is megalodon the shark real

Yes, it is. But it's already extinct.
It WAS real. Although there are some people who believe that megalodon sharks could still exist, in the deepest parts of the ocean, most scientists believe that they went extinct millions of years ago.

Megalodon was about 50 to 60 feet long on average, although some may have grown to 100 feet. For comparison, the great white shark today (the closest living relative of megalodon) grows to an average of around 12 to 16 feet, although some can grow as long as 25 feet.

See the Related Links below for further reading.