Google has created a single website where developers can see how to use its various APIs to integrate them into their applications. The firm offers developers the ability to access its various services such as Shopping, Translate and Buzz through the use of its APIs.
Developers can execute example API calls and see debugging information, giving them valuable information that should save time in implementation.
Not all of Google's APIs are currently listed in the APIs Explorer, with the most notable exception being its Maps API.
By default Google has disabled access to private data, though developers who want to test out APIs that require access to such data can do so by manually asking the APIs Explorer to switch to private access.
Google's goal is to let more developers use its services, which in turn will help it generate more cash from advertising. Its APIs Explorer is just a way of making it easier to use Google's services within third party applications.