>> What Is Email/E-mail/email/e-mail?

Definitions of Email:

Basic defi...: Electronic mail, sometimes written as E-mail, e-mail or email. This is the way in which messages are passed from one computer user to another using a local network or by using modems over telephone lines. The message is eventually delivered to the recipients mailbox which is a file on his/her computer and it can then be read using a mail program such as Yahoo Mail, Hotmail, Gmail, Eudora or Microsoft Mail. [defi by ~ http://www.walsalleducation.org/wegfl/about_grid/content_help/faq.cfm]

Advanced defi...: http://www.webopedia.com/TERM/E/e_mail.html

Examples of E-mail Service Provider:
1) http://www.yahoo.com

2)http://www.gmail.com