add-on
- Refers to an object or element that can be appended or supplemented to something else
- Pertains to an aspect or feature that can be included or incorporated into another item
- The navigation system was an add-on to the basic car model.
- The organizers provided an add-on service of delivering the product directly to customer's place.
- The software developer created an add-on to improve the functionality of the existing program.
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