Wikipedia defines a domain name representing an Internet Protocol (IP) resource, such as a personal computer used to access the Internet, a server computer hosting a web site, or the web site itself or any other service communicated via the Internet.
ICANN, the non-profit Internet Corporation for Assigned Names and Numbers leads the domains managed by multiple organizations including:
WHOIS ICANN domain lookup - a database that documents the owners of domain names, and includes names, addresses, phone numbers, emails, dates, and IP addresses
Name.com
Namecheap.com
1&1.com
Newer and less-crowded domain suffixes include .xyz.
Protect your domain name by:
Administrative detail monitoring
Domain owner - do NOT permit employees, website developers or other third parties to be listed as either the registrant or the administrative contact
Registrant - you are listed as the legal owner of the domain name
Administrative contact - the individual with rights to alter the domain record
Technical contact - the person responsible for technical issues with the domain
Domain name registrar
Strong password
Confirm emails sent by domain registrar are not blocked by your email spam filter
Registrar has a permanent email address
Lock the transfer of your domain
Domain name registrars provide domain lock/transfer lock/register lock to stop your domain name from being deleted, transferred or modified without your prior and explicit permission
Monitor expiration dates
Set task reminders
Consider
Multiple years renewal instead of annual
Combining multiple domain names to consolidated expiration dates
Register domain name as a trademark
May prevent other parties from utilizing similar domain names
Implement Extensible Provisioning Protocol (EPP)
Requires a particular code to be provided to a new domain name registrar before a transfer; thus providing an extra layer of security
Obtain similar domain names
Alternate top-level domain names such as.box, .net. and .org
Beware of spammers and other malicious communication
Responding to emails