Glossary

ProgrammableWeb's glossary of API and other technology terms and defination
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PubSubhubbub

WebSub (formerly PubSubHubbub) is an open protocol for implementing the publish-subscribe pattern, in which a client subscribes to real-time notifications of changes. WebSub can be thought of like RSS, but for any type of data or file format. Blogs, news sites, and social networks utilize WebSub to push new data, enabling real-time event streaming. Using WebSub, subscribers can receive updates only when things change. This improves the standard method of polling for API responses, also known as a request-response pattern