Open API

Private APIs can significantly diminish the development time needed to manipulate and build internal systems that maximise productivity and create customer-facing applications that improve market reach and add value to existing offerings.

Most commonly the organization simply chooses not to document such an interface, such as in the case of undocumented functions of Microsoft Windows, which can be found by inspection of the symbol tables.

Nevertheless, the use of undocumented functions on Microsoft Windows have become so widespread that the system needs to preserve old behaviors for specific programs using the "AppCompat" database.

Open APIs can significantly increase revenue without the business having to invest in hiring new developers making them a very profitable software application.

[11] For example, publishing open APIs can make it harder for organisations to control the experience end users have with their information assets.

Open APIs are favoured in the business sphere as they simultaneously increase the production of new ideas without investing directly in development efforts.

When a web API fetches data from a website, the application makes a HTTP request to the server the site is stored on.