Let's split the two terminologies to understand their purpose better. To capture information online, users can click a button instantly to access the data. The process is smooth, and there are no lag times to achieve the same. This happens because behind the scenes there is an voice call API that makes it possible. API stands for an application programming language, and its main purpose is to make accessing anything simple and quick. So, how does a voice call API work? Audio APIs can be easily embedded into any application.