What Is an IP Address?
Think of an IP address as a mailing address for your device. Just like the postal service needs a street address to deliver a letter, the internet needs an IP address to deliver the webpage you requested back to your computer, phone or tablet. Without it, the network would have no way to know where to send the response.
The IP address shown above is your public IP — the one the rest of the internet sees. It is assigned by your Internet Service Provider (ISP) and is shared by all devices on your home network through a process called Network Address Translation. The address itself is structured: each level — network, subnet, device, port — narrows the scope, just like country, city, street and house number narrow a postal address.