Render is a material that is applied to an external wall. It is used to enhance the look of a building, how it weathers and it functions thermally. The materials used to make render can range from a simple sand and cement mixture to a chemically manufactured compound.

Render bead is a general term applied to beads that are used in the rendering process.

Rendering is the process of applying render to an exterior wall. 

Where a wall meets a frame in the opening of a wall. Typically a window or door.

Rough cast is a technique for applying a top coat to a rendered surface. Rough casting is also used as a term to describe finishes such as pebble dash and spar dash.