E-mail or electronic mail uses networked communication systems to transmit messages. Also documents containing information may be attached and sent along these messages. Because of the networked nature of the communication systems used to send electronic mails, these may be sent to users anywhere in the world in a matter of seconds. The speed and large amount of data that these communication systems can handle have changed the way people communicate with each other.
When you send an email to a given address, your ISP (Internet Service Provider which is the local company that provides your internet connections and maintenance) uses its computers and communication systems to locate that address and makes sure the email gets there.
Received e-mails are stored in mailboxes until you open them for reading. E-mails may be stored, deleted or forwarded to other people.
You need an e-mail address of the form email@example.com in order to b able to send and receive e-mails. Google, Yahoo, MSN and many other companies offer free e-mail services that may be used online.