Serving Tiles

Tiles are the individual images, that when used in combination with another tool (e.g. Leaflet, Open Layers, Marble, ...) form a map.

Tileserver Components

Database

Usually postgresql, with postgis

Renderer

Usually Mapnik, and renderd (part of mod_tile (not in Debian, no ITP yet))

Stylesheet

opentreetmap-carto (not in Debian, ITP #744842)

Web Server

Usually Apache with mod_tile (same as above (not in Debian, no ITP yet))