Every device or computer connected to a network (Including the internet) must have a unique address so that when you connect to a website it knows where to send the web page information to, so that you can see it and not someone else. This address is an IP address and is typically made up of 4 parts separated by dots. e.g. 123.678.123.345
It is pretty much like a telephone number in some respects as it is a sequence of numbers that identifies your computer, your area and the country in which your computer is located.
In the majority of homes the IP Address that is visible on the internet is actually the address of your Internet router and your router then has a mechanism for delivering the information to each individual computer in the home.
The individual computers on your home network have their own range of IP Addresses which are only unique to your home network (Sub-domain). Your router then has the job of organising , translating and “routing” information on to the correct computers in your home and back out to the internet.
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