When should you consider using the REST API in Salesforce?

The REST API in Salesforce is designed to provide a simple and efficient way to interact with Salesforce data and services, making it highly suitable for cases where simplicity and ease of use are paramount. The RESTful approach is more intuitive for developers, especially when they need to work with lightweight interactions over HTTP, such as GET and POST requests.

For scenarios where quick integration is necessary, the REST API offers a straightforward means to access and manipulate data without the overhead associated with more complex protocols. Developers can easily integrate Salesforce functionalities into web applications or mobile apps, leveraging the familiar JSON format for data representation. This enhances the ease of use, making it a go-to choice for many developers aiming for straightforward integration tasks.

In contrast, high-load asynchronous operations might be better suited for the Bulk API, which is specifically designed to handle large amounts of data processing efficiently. Integrating exclusively with Java applications can utilize other APIs but doesn't inherently favor REST over SOAP or other integration methods. Lastly, graphical user interfaces typically rely on different technologies, such as Visualforce or Lightning components, rather than being directly dependent on the choice of API.