Some registrars say ICANN supported, what exactly does this mean? There is a registrar called www.whiz.in. They do not say ICANN supported, does this mean that any domain registered with them is rendered useless?
have a look here hopefully this will explain you everything much better then we ever could en.wikipedia.org/wiki/Icann
All 'Registrars' are ICANN Accredited. Whiz.in does not appear to be an accredited Registrar but is a reseller for an accredited Registrar. Resellers are common and legit and often cost less than buying direct from a Registrar. Level of support, professionalism, and responsiveness varies greatly among resellers. If there is a problem it may take longer to get it resolved than dealing directly with a Registrar.