Web Hosting is the service provided by hosting providers for example Godaddy, Hostgator, LiquidWeb and NameClues.
You can use your computer to host your application but this time consuming and also you need to check whether your computer are working 24x7. If you choose third party provider they are available 24x7 to check your site is working or host.
Hosting means that simply saves your site on remote server.
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