What are REST APIs?

Naturally, most applications and services built on and running in the cloud rely on REST APIs:
A REST client is a tool that simplifies technical communication with REST APIs. It provides an interface to required technical communication protocols such as HTTPS, and facilitates their use.
Discovering SAP Build Process Automations APIs in SAP Business Accelerator Hub
When entering the SAP API Business Hub (link to be replaced shortly) and searching for the product SAP Build Process Automation, you'll find the according API package. Following, you find the different APIs it contains, and one example each on how these APIs could be leveraged.
Finding an Endpoint to Use
Let's say you would like to find out how to trigger a new process or workflow instance using the SAP Build Process Automation APIs.