Email summary

There are many good points to emails. These include:
-Instant communication
-Reliable
-Fast
-Secure
-Simple to use
-Can see date and time it was sent
-Can compose messages with subject headings
-Can be sent to more than one recipient
-Attachments can be added
-Drafts can be saved
-Can be received when the recipient is offline
-Can be sent directly to a mobile device

There are also many bad points. These include:
-Has to be sent to someone with a computer
-Requires an internet connection
-Spam can be received
-Viruses can be received

This is a very basic diagram of how it works: