Domain is either you or your company's ID in the Internet, when you apply to connect to Internet, they will give you protocol number. Every device connected to Internet has an IP number. Webmasters, publicists and ad networks assess your website that base on alexa rank estimation of your site or online journal.
Over the time it has been ranked as high as 750 299 in the world.
Your website address or its sub-links called deep link.
Those links are very important, because search engines and the users are reaching those links.
Information : Page Speed is the speed at which your site responds to commands input.
It is more important and beneficial for your site to have this at a lower value.