What is a domain name?
A domain name is a brand that people use to find you on world wide web.
Google is a brand name an Google.com is the domain name for this brand.
Where to buy a domain name?
Domain is bought via a domain registrar.
GoDaddy is world’s biggest domain registrar.
Other reputed domain name providers as Enom and Moniker.
You need not spend a fortune on a domain. A good domain can be bought for around $10.