"Many Imperial worlds are under some austerity program, and the ones that don't have New Order on the brain. There, you wouldn't know a decent holoboard if you saw one. Celanon, Nar Shaddaa, Ixtlar — plenty of worlds got a multicolored skyline — but even they pale before the shine of a Corporate Sector world."
―Han Solo[src]

A holoboard was an advertising platform. They were prevalent throughout the Corporate Sector, and on planets such as Celanon, Nar Shaddaa, and Ixtlar.