Explaination on the following Please.

Discussion created by deedug on Sep 10, 2012
Latest reply on Sep 11, 2012 by tereshenkov
Hello all can anyone explain to me the following and an example of how to use them.
I am half way there but dont understand the mechanics behind all.

Add ArcGIS Server =   This gives you direct access to ESRI database of their online Maps?

Add ArcIMS =  No idea what this does?

Add WCS Server =  Also no idea?

Add WMS Server =  Guessing, but can I hook into someones elses database of Maps and layer?