Its probably best to let Hornby explain what DCC is as they are aiming their information at absolute beginners:-
Hornby DCC information
and Bachmann have an information page too:-
Bachmann DCC information
For somebody on a tight budget and an absolute beginner to railway modelling then really its probably best to look no further than the starter systems offered by these two companies. A basic Hornby or Bachmann DCC control console and 4 locomotive decoders can be purchased for under £75 if you shop around.
Happy modelling
Gary
Hornby DCC information
and Bachmann have an information page too:-
Bachmann DCC information
For somebody on a tight budget and an absolute beginner to railway modelling then really its probably best to look no further than the starter systems offered by these two companies. A basic Hornby or Bachmann DCC control console and 4 locomotive decoders can be purchased for under £75 if you shop around.
Happy modelling
Gary