This update was released in August 2013. The purpose of this update was to understand the intent of the user in the query and provide the results best suitable for a user. Instead of ranking a page because of keyword density, this update understands the semantics of query, relevancy of content and provide the suitable results in SEO
For example, if you search for keyword: “which is the best business hotel in Hyderabad ?” then hummingbird will understand the intent of the user and provide the results for “best business hotel in Hyderabad” by ignoring the words [which is] and [?] to provide relevant results.
Credits to Moz.com
