computer which is connected to the internet. This then gives people
who surf the internet a way to access your website. The computer that
the web hosting company uses is typically just like the computer you
have at home, the only difference being that it is set up to serve up
web sites and is therefore called a "server".
A web host will typically have a fast connection to the Internet and
they may host thousands of web sites on many servers. The web host
essentially rents out space to you so that you can get your website
up on the world wide web.
Some large web hosts own their own datacenter (collection of
servers), some rent a server from a larger web hosting company and
then resell the space under their own company name. In this case the
web host will manage your account on the server, but they will be
renting the actual web space from another much larger company.