Who hosts my domain?

This question is slightly erroneous for the Domain Names are not hosted but registered. Hosting can be associated with any given Domain Name, but then it is more correct to say that you have a webhosting provider who hosts your website and not your domain.
Let us make the distinction a bit clearer – you do not host domain Names but a website. You do not register a website but a Domain Name. Despite the fact that these two services are intrinsically connected they are still different. It is important to know this difference because very often the site is hosted by one company, while the domain is registered with another. If you confuse these two service providers, soon you will encounter difficulties in maintaining and managing your website properly.
The webhost is the company which provides you space on its servers for you to upload your site with all its multimedia, texts, pictures, databases, etc. The majority of these companies offer great variety of hosting solutions which involve monthly, biannual, or annual fees. They provide many tools and products which would enable you to establish serious presence on the global stage of the World Web.
The Domain Name Registrar is the one who helps you manage your Domain Name. Its management is limited to several basic for the domains functions but each one of them is crucial. Most important of them all is the renewal of the Domain Name. It can be registered for minimum one year and must be renewed before the year is over, otherwise its functionality will be interrupted.