A host in the respects of my sites will be the company that provides you with website, and email storage for other people to read the content you wish to provide. In my case, Dreamhost is my current host for everyone of my domains with exception of fsp.tel which. requires that you host those domains through TelNames. If you are trying to choose a host, I will recommend that you find a hosting company that would meet or exceed your needs. While your domain name will not change if you move to another hosting company, it is some work to transfer, especially if the new host does things differently, and you have a lot of websites to transfer over.