Think that's what they're called. The .com, .net, .org etc. at the end of the domain name. Is there any pros and cons with these to consider, or is it just a matter of preference for the way it sounds, or to make the same name available with a slight difference at the end. Anything which picking the wrong one can have a bad effect on? I see to register some is more expensive than others, is this just worked on popularity? Sorry for all the questions.