Attachment can be added through while sending an email to a recipient.
Electronic Mail or e-mail is a method of exchanging messages between people using electronic devices.
Ray Tomlinson is universally credited as the creator of e-mail as part of a program for ARPANET in 1971.
He developed the first system able to send mail between users on different hosts across the ARPANET, using the @ sign to link the user name with the destination server.
By the mid of the 1970s, this was the form recognized as email.
Email operates across computer networks primarily the Internet.