 "Blocks" are spacers between studs such as where an interior wall attaches an exterior wall and for framing corners such as a "three-stud corner with blocking".Blocking is used for panel edge supports such as sheets of drywall or plywood also called "back blocking"

Blocking, often called "backing" or sometimes "grounds", also refers to pieces of wood or other material that run between wall studs in order to provide support and attachment sites for mounted hardware or trim such as cabinets, shelving, handrails, vanity tops without a cabinet underneath, bathroom towel bars, mouldings etc.Properly installed blocking is easier to find and use for attaching wall hardware than studs alone.