Drywall is used to create the interior walls of a house. It is made of gypsum plaster and is wrapped in a thin cardboard. It is the most commonly used building material in the world for the construction of interior walls and ceilings. There are three different types of drywall: regular white board, fire-resistive, and green drywall. Green drywall is used in areas where a high level of humidity is expected. If you are hanging your own drywall, there are a number of different tools you will need to have.