The niche in terms of classical architecture is basically an exedra or an apse. This is basically reduced in size. Nero's Domus Aurea was the foremost semi-private residence that comprised of quarters that were given a designed touch of richly wide-ranging flooring plans, fashioned with niches and exedras; covered in astounding and amazing polish along with white marble, such bent surfaces strenuous or isolated the daylight.
In terms of Gothic culture a niche is something that is situated in a tabernacle frame work. It is richly decorated as a small house, and is also served as a reliquary. Mostly across the globe a niche decoration is found as the backdrop for altars in churches and mostly found in the form of statues.