noun
value-added service
A service that adds extra value beyond the basic offering, often used in business, telecommunications, and IT contexts.
この通信会社は、基本料金に加えて付加価値サービスを提供している。
This telecom company offers value-added services in addition to the basic plan.
付加価値 means 'added value' in general, while 付加価値サービス specifically refers to a service that provides such added value.
Compound of 付加価値 (added value) and サービス (service), likely a calque from English 'value-added service'.