The brand new algorithm from Google, Hummingbird is designed to provide faster & more precise search results. It is the biggest update from Google since 2001 and caters mostly to the mobile users.
The impact of Hummingbird is relatively lower in comparison to the mayhem created by Penguin 2.1 amongst webmasters & SEOs. However, it is still essential for you to know which sites are being targeted by Hummingbird and measures to prevent your site from getting hit by the new algorithm. DigitalRelevance has come up with an interesting infographic on Hummingbird.