The domain is like an identity for your website like Name is for human being and Brand name for your Business. Nowadays it is even more important to buy a domain name for your business to avoid brand name theft. Another name for domain registration is website registration. Hence Domain Name Registration is an essential part of a website, in other words, a website cannot exist without a domain name.
For example, the domain name xyz.com identifies the organization xyz.com. If a user types the domain name xyz.com in the browser or sends an email to the xyz.com, the DNS (Domain Name System) will change the domain name into the IP addresses. Later they are used by the Internet for the purpose of connecting the user to the xyz.com's web presence.
Always choose unique domain names but make sure your domain name is easy to remember as it is will help you to attract the customer. Your domain name should reflect your business & brand name. If desired domain name close to your brand name is not available in .com or .in extension then you can go with another popular extension.