Access Data Across the Web
Select, filter, sort and join data across web services. You can even insert, update and delete from YQL.
Easily Scrape HTML
Scrape HTML from the web and turn it into data to reuse. Create an API where one doesn’t exist.
Transform XML to JSON
Use YQL to convert XML to JSON & vice versa. Access atom, rss, micro formats and more. You can even load CSV files from anywhere.
Speed up Your App
With YQL, apps run faster with fewer lines of code and a smaller network footprint. Batch multiple HTTP requests into a single request.
Mashup Data Sources
Mix and match data from disparate sources using YQL sub-selects.
Extend it
Define Open Data Tables to access any data sources other than Yahoo Web Services
https://developer.yahoo.com/yql/