What defines a Composite API?

A Composite API is characterized by its ability to combine multiple existing functions into a single request. This offers significant advantages in scenarios where multiple pieces of information are needed simultaneously, such as retrieving related data from different resources in a single call. By aggregating these requests, the Composite API reduces the number of calls that need to be made to the server, which minimizes latency, increases efficiency, and optimizes performance.

In the context of Salesforce and similar environments, these APIs are particularly useful because they streamline interactions with systems that have complex interdependencies between data entities. For instance, instead of executing separate calls to fetch account and contact details, a Composite API can retrieve both in one go, enhancing the user experience and the overall responsiveness of applications.

While other options may describe various API characteristics, they do not capture the essence of a Composite API as effectively as the one that highlights its ability to combine multiple functions into a single request. This capability directly addresses the needs of developers and applications aiming to enhance performance and reduce overhead in communication with backend systems.