NAME and domain ADDRESS.An email address consists of 2 parts are following:-A local partThe local part of it (email address) may be unquoted or may be enclosed in quotation marks.If unquoted, it may use any ASCII characters.A domainThe domain name has to conform to strict guidelines and it must match the requirements for a hostname.An E-mail address identifies an email box to which MESSAGES are delivered. An example of an email address [email protected]gmail.com.The email addresses are OFTEN requested as input to the website as VALIDATION of user existence.Other validation methods are available, such as cell phone number validation, fax validation, and postal mail validation.