Websites are hosted on a publicly accessible server. A website may need an entire server to itself or it may share a server with 100s of other websites. The storage space, and the features that come with it, make up the hosting plan.
Google provides website analytics tracking for free. Unless you have a client who is internet savvy they will not know how to access their website analytics and they won't know what they mean. If you want to be a great webmaster then you need to understand how to install tracking code on each website and understand how to communicate the analytics to your clients.
