In most cases, your browser will automatically include the desired site address, either in the subject line, the body of the message, or as an attachment. Click Send on the Toolbar. If e-mail is a letter, an attachment is a package. Attachments enhance e-mail exchanges in many ways. Chances are your usual e-mail exchanges are informal, written in plain unformatted text.
Unformatted text is text lacking graphics, without underline, color, italics, or boldface.
Using attachments will allow you to transfer a formatted text file by e-mail. An unformatted exchange is similar to sending a quick note, while an attachment can be similar to sending a manuscript. One is a letter, the other a package. Don't send someone a piano as a package. Size of attachments can increase download time, forcing your recipient to wait to read what you have sent.