Definition: Any advertising done outdoors that publicizes your business's products and services. Types of outdoor advertising include billboards,Hoardings,Unipole, bus benches, interiors and exteriors of buses, taxis and business vehicles, and signage posted on the exterior of your own brick-and-mortar location.
A billboard (also called a Hoarding in the UK and many other parts of the world) is a large outdoor advertising structure (a billing board), normally found in high-traffic areas such as beside busy roads.
Unipole or Monopole
Unipole or Monopole is basically an advertising sign (usually Billboard) frame structure mounted atop a single steel pole or column.