ESRI will offer a complimentary Web seminar this month on how to use the new ArcGIS JavaScript APIs to build high-performance, easy-to-use online mapping applications.

Developers use application programming interfaces to hide complexity, organize code, design reusable components, and connect different systems, applications, or services.

Microservices also make it easy to expose services to external users using APIs, perhaps relying on rich JavaScript clients to generate web pages and views on the client device.