Every domain ( eg: yourdomain.com ) on the Internet needs to be "hosted" somewhere
so that people can access it. Typically, hosting is done on dedicated servers that
are never shut off, so that people around the world can access them 24 hours a day,
7 days a week.
These servers run software that is specially designed to handle connections from the rest of the Internet to serve up requested web pages and content. Yet at the same time this software prevents this content from being altered without the author's request.