Imagine you have to take a taxi somewhere and when asked where you’re going, you respond, “I want to go to the store!". The driver then turns around confused and asks, “okay then, which store?" You reply, “The one I keep hearing about." He scratches his head and drives you in circles for hours. Without an address or location, the taxi, or the web browser in this case, is not going to know where to take you on the Internet.
There are millions of websites in the virtual world, just like there are millions of stores in the real world. Your website has to have a name, therefore it has to have a domain so everyone knows what to call it and where to find it. For example, “Target" is a store, but it’s also their Domain Name, Target.com.
See More Frequently Asked Internet Questions Here.