Yahoo! Answers is world's leading Q&A site. Our APIs let your users ask and answer questions on your site, and provides access to query and display interesting content from our database of resolved questions.
APT brings advertisers, publishers, ad networks, and agencies together in a single system, making buying and selling advertising easier and more profitable for all.
BOSS is Yahoo!'s open search web services platform. Developers can use BOSS to build and launch web-scale search products that utilize the entire Yahoo! Search index.
Contacts are relationships that exist in your Yahoo! address book, such as those entered from across the Yahoo! Network like Yahoo! Mail and Yahoo! Messenger. The API provides read and write access.
Content Analysis detects, ranks, and resolves entities in unstructured content and classifies a document against our taxonomy.
The Design Pattern Library shares user interface design patterns vetted by Yahoo! with the web design and development community.
Yahoo! Fantasy Sports allows users to compete against each other using statistics from real-world competitions. The API provides rich data on leagues, teams and players.
The Finance RSS feeds from Yahoo! provide a variety of information including top financial stories, dynamic feeds for companies based on ticker symbol, and articles by Financial columnists.
Flickr is a photo-sharing community that enables users to upload, tag and comment on their photos and other users photos. The API provides viewing and uploading access.
Yahoo! GeoPlanet is a resource for managing all geo-permanent named places on Earth. The API provides an open, permanent, and intelligent infrastructure for geo-referencing data on the internet.
Apache Hadoop is an open source Java software framework for running data-intensive applications on large clusters of commodity hardware, allowing storage and retrieval of large distributed data sets.
The Yahoo! Local API provides a comprehensive database of information including business address and phone, category, rating, distance, URL, and traffic alerts.
Yahoo! Mail is a free, web-based email service. The API lets you display message summary information, parse message contents, manage folders, and compose and send messages.
Yahoo! Messenger is the premier instant messaging (IM) platform. The SDK offers a platform for contact and group management, presence, real-time communications, and data transfer.
OAuth is a simple, secure, and quick way to publish and access protected data (photos, videos, contact list).
OpenID is an open standard that makes it easier for users to login to sites. Yahoo! is an OpenID supplier, meaning users can login to your site with their Yahoo! ID.
Pipes is a powerful composition tool to aggregate, manipulate, and mashup content from around the web.
PlaceFinder is a geocoding Web service that helps developers make their applications location-aware by converting street addresses or place names into geographic coordinates (and vice versa).
Placemaker helps developers make their applications location-aware by identifying places mentioned in text, disambiguating them and returning unique identifiers (WOEIDs).
RSS is a mechanism for web site developers to publish headlines and frequently-updated content as a web feed. Yahoo! provides a variety of product and service RSS Feeds.
Yahoo! Search Marketing allows third parties to advertise their business in search results on Yahoo! and other popular sites. The API lets you manage campaigns, pull reports, set bids and more.
Social Directory describes a user's identity on Yahoo!, including their Yahoo! profile and relationships information. The API provides read and write access to public and private information.
The Term Extraction Web Service provides a list of significant words or phrases extracted from a larger content.
The Weather RSS feed enables you to get up-to-date weather information for your location.
The Yahoo! Application Platform enables developers to create and deploy their applications across the Yahoo! network of sites. It is based on, and supports, open standards including Open Social.
The YQL platform provides a single endpoint service that enables developers to query, filter, combine, execute and store data across Yahoo! and beyond.
YSlow is a Firefox add-on (integrated with the Firebug development tool) that analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.