The view type YQL Query: Flexible allows for creating views that query data not from Drupal's own database, but from data tables available at the Yahoo! datatables.org project. The project includes data from Google, Wikimedia, Yahoo!, Github, New York Times, Amazon, and many more providers.

Some important concepts for using views of the type YQL Query: Flexible are

To use YQL Query: Flexible you must yourself provide some data about the table against which you query. Using the YQL Console at Yahoo! Developer Network is a great help in doing this.