What the heck is hosting and why do you need it?

Thanks to Wikipedia we have all the info you need right here.

A web hosting service is a type of Internet hosting service that allows individuals and organizations to make their own website accessible via the World Wide Web. Web hosts are companies that provide space on a server they own or lease for use by their clients as well as providing Internet connectivity, typically in a data center. Web hosts can also provide data center space and connectivity to the Internet for servers they do not own to be located in their data center, called colocation.

So basically, you need hosting to make your website available to everyone else on the internet.

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