Definition of "postback?" ?
Basically all the information of a webpage is sent back to the server for reprocessing.
Source(s):
http://en.wikipedia.org/wiki/Postback
When you buy a plane ticket on the internet, you fill in your name, credit card number, etc and choose a flight.
When you click 'Submit' button, the information you typed and choices you made are "posted back" to the mothership - i.e. the web server - so that they can reserve your seat and take your money - hence the term "postback".
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