When you arrive in the Nether for the first time, one thing that will stand out are the massive white things with tentacles that are flying around. To make things worse, they shoot big fire bombs at you which gives little time for you to study them. What are these creatures called?
The large flying white enemies in the Nether are called Ghasts. You can find out more about them here. They are powerful creatures that can be difficult to kill at first, but they are not actually as hard as it might seem at first. Using a sword is the best way to kill them.