I think this is the right forum... In non-techie laymans terms would someone be kind enough to explain to me in very simple terms the difference between a VPN, ADSL, IDSN and fibre optic channel ? Are they basically all the same thing, or does the VPN sit on top of the others as I suspect. If so, I'd be obliged if someone could tell me what the VPN does and its relationship with the ADSL/fibre optic etc. This would help me have a half-sensible discussion with an IT person at my part-time civvy job.