How is electronic mail (email) defined?

The definition of electronic mail (email) as a written form of communication between connected computers is indeed accurate. Email allows users to send and receive messages across the internet or other computer networks. It encompasses the transfer of text, documents, images, and other files between senders and recipients, utilizing existing network infrastructure. This form of communication relies on standard protocols such as SMTP (Simple Mail Transfer Protocol) for sending messages and POP3 (Post Office Protocol) or IMAP (Internet Message Access Protocol) for retrieving them.

Other options presented do not align with the definition of email. Video conferencing methods, for instance, involve real-time audiovisual communication and differ from the asynchronous nature of email. Similarly, online purchase methods pertain to e-commerce transactions rather than written communication. Lastly, file-sharing services focus on the exchange of files rather than facilitating communication between users. Thus, the choice that defines email effectively captures its essence as a digital correspondence tool between users connected through computer networks.