  Graph covers are a way to describe continuous maps (and homeomorphisms) of
the Cantor set, more generally than e.g.\ Bratteli-Vershik systems.
  Every continuous map on a zero-dimensional compact set can be expressed by a
graph cover (e.g.\ non-minimality or aperiodicty are no restrictions).
  We give a survey on the construction, properties and some special cases of
graph covers.
