What is Google Hummingbird?

Unlike the previous Panda and Penguin updates which were initially released as add-ons to Google's existing algorithm, Hummingbird has been cited as a complete overhaul of the core algorithm.

Google Hummingbird is a search algorithm used by Google from August 30, 2013. It was designed to embody the special characteristics of speed and precision.

Hummingbird is the codename given to a significant algorithm change in Google Search