APIs bring a new level of modularity to applications. APIs allow developers to leverage the expertise of other applications. When an organization develops an application, they no longer need to reinvent the wheel when it comes to things like authentication, communication, payment processing, and maps.
Instead developers can leverage the seamless plug in capabilities and functionality of APIs. APIs allow applications and system components to communicate with each other on internal networks as well as over the Internet.
They’ve become integral to enterprise efforts to make internal applications and services accessible over the Internet to business customers, partners, suppliers, and other third parties.