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English definition of “add-on”

add-on

noun [C] uk   /ˈæd.ɒn/ us    /-ɑːn/
a piece of equipment that can be connected to a computer to give it an extra use: A printer is a useful add-on.Computer hardware an extra part that is added, especially to an officially organized plan, system, agreement, etc.: Legal expenses cover is often sold as an add-on to household insurance policies.Things added or attached to other things
(Definition of add-on from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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