Megalodon, meaning "big tooth", was the largest shark of all time. Its scientific name is 'Carcharocles megalodon'. It lived from the early Miocene to the Pliocene epochs, 23 to 3.6 million years ago (mya). It is not closely related to the present-day great white shark.

Megalodon had teeth, which are among the largest ever found, over 7 inches (18 cm) long. Paleontologists calculate that the shark was up to 18 meters (59 ft) long with average length of 10.5 meters (34 ft). It weighed up to 48-49 metric tons.

Fossil records of C. megalodon indicate that it occurred in subtropical to temperate latitudes. Megalodon hunted large and medium-sized whales, attacking the bony areas, such as chest, fins, or tail. The megalodon bite is considered one of the strongest bites in the animal kingdom’s history.

Its great size, high-speed swimming capability, and powerful jaws coupled with formidable killing apparatus, made it an apex predator eating a range of fauna.

More Info: en.wikipedia.org