Correspondence schools conduct instruction by exchange of letters.
Historically, this was through physical mail, but now is commonly through e-mail or other Internet-based technology.
An advantage of correspondence education is the opportunity for the student to work at his or her own pace, rather than at the pace of the class.
Disadvantages compared to traditional schools include lack of discussion and interaction with fellow students.
Some unaccredited schools are little more (or nothing more) than diploma mills which exist to grant pieces of paper.
The term 'correspondence school' is now seen as somewhat old fashioned. A more contemporary term is 'distance learning' or 'distance education'
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