An email is an electronic message that is sent from one computer to another. You can send or receive messages that include attachments like pictures, documents or programs. A snail letter will stop at many different postal stations and will be rerouted until it finally reaches your mailbox. This can take anywhere from 2 days to 2 weeks depending on the letter's final destination.
Email passes from one computer to another as it travels along a network.
Each computer reads the email address then routes it to another computer until it finally reaches your electronic mailbox where it sits until you download it. This usually takes a matter of only a few minutes, regardless of the message's final destination. The first part is the person's user name. The second part is the domain name, which tells the email server which computer the recipient's email account is on. Outside the United States, they must also include the country.