We have all probably used drywall at one time or another in our lives and we know what it takes to finish the stuff even if we have never touched. We know that it goes on all inside walls and that it wont hold heavier hangings like shelves and large pictures and so we need to find the studs beneath. We may have also had experience repairing a hole that was intentionally or unintentionally placed in a wall. Plaster work is definitely something that takes practice but thankfully it is sandable and therefore our mistakes are not permanent. But we probably dont know why it is used, and I am here to change that.
Drywall the most commonly used interior wall covering throughout the world for several reasons. First and probably foremost is that it is cheap. It is simply gypsum which is a ubiquitous and easily obtained substance sandwiched between two sheets of heavy paper which gives the drywall stability. The material is easy to work with and therefore very useful across a wide range of applications. It also provides a nice finished surface that is very paintable and also repairable.
Another reason why drywall is used is that it provides a barrier to the movement of fire...