Single page applications such as Angular are often a component in service-oriented architecture (SOA) that relies on external web services as the data sources for our web application. Introducing networked services into our application also brings with it a lot of asynchronous behaviors that we have to resolve both technically, and in our user interface.

The most common form of interaction between these services and a frontend application is via an HTTP request to a RESTful API. In this section, we will cover how to connect to a RESTful API in Angular and work with that data in our application.