Emails are digital.
Created on a computer or tablet or smartphone.
Emails can be sent and received right away through the internet.
Emails can be deleted.
LETTERS
People write letters on paper.
Letters go through the US. Postal System and require a stamp.
Letters take longer to receive.
People write them.
People use them to communicate.
They can be sent to people.
They can be Formal or Informal.
You've Got Mail...Writing Good Emails
(author: Ms. Oswald)