An email domain is the part of an email address that comes after the "@" symbol. It is the unique identifier for an email account, much like a street address is the unique identifier for a home. Each email domain is associated with a specific mail server or servers, and it functions like a virtual street name that lets an email get delivered to the right address. An email domain can have an almost unlimited number of email addresses associated with it. For example, if a business is called "XYZ Corporation," its domain name could be "xyzcorporation.com," and the email address could be "[email protected]". To get an email domain, one must first purchase a domain name from a domain registrar.