Up to this point, we have been looking at how to allow other systems and external guests to interact with our data and customization on the Salesforce1 Platform. Now, it's our turn to talk to other systems! Introducing Callouts. These are HttpRequests that allow Force.com to perform programmatic requests over the Internet to available web service APIs such as Google Maps, Google Calendar (we'll show you how in Chapter 7, Use Case—Integration with Google Calendar), payment processors (we'll show you how in Chapter 8, Creating a Property Management Application), and others. Plus, as an added benefit, we'll show you how to connect back to the web services that we just worked on together, and test them right from within the same instance of Salesforce. Let's get started!