Drywall is a gypsum plaster board used in walls and ceilings that requires experienced professionals to install. The process involves multiple steps and roles, beginning with an estimator inspecting the site and calculating materials needed. Then, installers measure and cut drywall boards to cover walls and ceilings. Any damage is repaired by repairers, while tapers cover joints and screws with compound. Finally, finishers apply additional compound and prepare the surface for painting. The document outlines the different jobs in the drywall installation process.