What is hosting
The dictionary describes hosting as:

“Web hosting is a type of internet hosting service that allows people and organizations to make their websites accessible via the world-wide web“

Hosting is like renting an office. You can do it yourself out of your garage, or you can pay for better facilities with all the essentials like plumbing and security . For an office this would mean renting in a business center. For your website this means paying for space on a highly specialized computer with a dedicated hosting facility. Just like an office directory , your website has a physical address that maps the exact location of the website within a hosted server. These physical addresses have their own  pages directory” Domain Name System” (DNS).
The DNS directory is like a GPS (Global Positioning System) for your website, and shows the route between your site’s URL (www. address) and the hosted servers location shown by their Internet Protocol (IP) address. The IP address is a unique number that identifies the physical location of a computer in a similar way that a postal code tracks a physical office location.