also: サードパーティー
noun
Refers to an entity other than the two main parties involved, such as in business, law, or technology. Often used in compounds like サードパーティ製 (third-party manufactured).
このアプリはサードパーティのサービスと連携できます。
This app can integrate with third-party services.
サードパーティ製のアクセサリーは安いが、品質に注意が必要だ。
Third-party accessories are cheap, but you need to be careful about quality.
More formal and legal term for a third party, often used in contracts and official documents.
Borrowed from English 'third party'.