OS produces many different GIS data products, and the diversity of these products is an indication of the many different ways in which GIS mapping tools can be used.
OS data products range from simple raster images of road-atlas-style mapping to very detailed vector data extracted from the OS National Geographic Database (OS NGD). From every address in the country, to all the political boundaries for voting in elections, this database is incredibly detailed. It shows every house, every fence, and every stream in every single part of Great Britain.
But not all data in GIS will look like a map. For example, OS product AddressBase is not cartographic, but designed to be used in conjunction with other layers of information within a GIS application.
AddressBase can be used to identify specific properties against a map backdrop, or to link to other sources of associated information using the Unique Property Reference Number (UPRN).