What is the Google Pigeon update..?

[PaulLejoy]

The pigeon update is started to roll out on July 24 for US English results,The aim of the update is to provide a more useful, relevant and accurate local search results. And unlike Penguin and Panda updates, this is not a penalty-based update (aimed at cleaning the SERPs from low-quality content), but a core change to the local search ranking algorithm.