The data might come from an incoming event, be calculated, or be retrieved from an external data source.

这些数据可能来自传入的事件，可能进行了计算，或者检索自外部数据源。

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The Virtual Field activity provides synchronous access to an external data source from a Domino application.

Virtual Field活动对来自Domino应用程序的外部数据源提供同步访问。

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The external data source could be another DBMS (database management system) like Oracle or SQL Server, or just an Excel sheet.

外部数据源可以是另一个 DBMS（数据库管理系统），比如 Oracle 或 SQL Server，也可以仅仅是 Excel 文件。

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In the simplest terms, an API is a set of code conventions which programmers can use to interact with an external data source or web service.

FORBES: With All Content Moving Mobile, Karen McGrane Writes, The API's The Thing