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English definition of “add-on”

add-on

noun [C]     /ˈædɒn/
something extra that is added to a product to make it better : DVDs often include bonus endings and other add-ons.an add-on to sth Many companies offer legal expenses cover as an add-on to home insurance policies . add-on parts / products / services
IT a piece of computer equipment or software that is added to a computer so that the computer can do more or different things: an add-on to sth It would require an add-on to a browser to make it all work . add-on devices / features / software
(Definition of add-on noun from the Cambridge Business English Dictionary © Cambridge University Press)
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