What is a domain?
To create a website or web application we first need to select a name which is known as a domain name, it can also be said that the name by which people will find your website is called domain name. For example, if we want to find Google Search Engine, we type google.com for Facebook, we type facebook.com. These google.com, facebook.com are the domain names for those organizations or services. Similarly the name that an organization wants people to type in the browser address bar to get that company website or application, will be that organization's domain name. Not necessarily domains need to use .com, there are other types too like .net, .info, etc to fit the organization or business or service type. And country code could be a part of the domain name too. Generally domain name is registered on a yearly basis and every year it needs to be renewed otherwise after a certain time other person or business may take that domain name.