Today, in the age of APIs, an API is not just a technical interface on top of a database. On the contrary, your API is your new business model. In the past, APIs were seen as just tools for Developers. But nowadays, their scope is not limited to internal use. The companies who make APIs are now exposing them APIs to external users around the globe. For example, Google Maps' APIs use Uber's APIs to calculate fares and travel times to destinations.