When it comes to the world's deadliest shark that would be the Great White Shark which has a recorded 314 unprovoked attacks on humans.
If you see a great white shark you don't want to get in the water with one or if you are you better try and get out of the water before it attacks you.
The Great White shark can and will kill humans even when you do nothing to it.
The next shark that is considered the most deadly in the world is the striped tiger shark with 111 attacks followed by bull sharks with 100 attacks and blacktip shark with 29 attacks.
All sharks are dangerous and can easily kill a human so avoid waters where sharks are if possible.