Final answer:
Drywall or sheetrock is a building material made of gypsum used for constructing walls and ceilings, with the term sheetrock being a brand name.
Step-by-step explanation:
The common building material known as drywall or sheetrock is a panel made of calcium sulfate dihydrate (gypsum), typically extruded between thick sheets of facer and backer paper, used in the construction of interior walls and ceilings. The term sheetrock is a brand name that has become a generic term for drywall. This material is favoured in construction due to its relatively simple installation and its effectiveness in creating smooth walls for homes and other buildings.