Though the builders know the difference is in the trademark drywall is sheetrock far the common man as the trademark has been well established.
Difference between sheet rock and dry wall.
Think of it like this.
Gypsum powder makes up drywall.
Sheetrock and drywall are made of flattened gypsum plates that are sandwiched between two heavy papers.
The difference is fairly simple as sheetrock is a name brand of drywall that is considered to be a reliable one that many contractors depend on trust in and use as opposed to more general types of drywall.
This creates a board or a thin sheet.
However due to its tremendous popularity people mislabel all sorts of drywall as sheetrock.
All sheetrock can be called drywall but not all drywall can be called sheetrock.
Sheetrock is simply a company that provides customers with the opportunity to purchase drywall and drywall products but their products are the same as generic dry wall.
Drywall is made of a few different materials but most commonly it is made from gypsum which is a sturdy yet lightweight rock that provides versatile uses when ground up into a powder.