Source: http://www.thesempost.com/user-experience-user-intent-affect-panda-penguin-google-algorithms/
A common practice among those in the SEO business is to focus on website elements and determine how these can be affected by Google algorithms like Panda and Penguin. However, while on-page elements do have a tremendous effect on SEO, there are two very important areas that should also be considered for best SEO practices: user intent and user experience. Defined below are some elements that are related to these two factors.
Mobile ranking algorithm update – takes into consideration how your site responds to mobile users expectations. With mobile search surpassing desktop search, Google is giving credit to sites that are mobile-friendly.
User Experience vs. User Intent
Pigeon – improve search results based on local cues.
Hummingbird – updated search engines to provide best results based on a user query eliminated non-relevant results in the list.
Penguin and page layout update – Google made an update to penalized low quality sites known as the Penguin update. It is made to punish sites participating in suspicious black hat link building practice in an effort to game the search engine.
Panda – this is an algorithm update that penalizes sites with thin content. This usually happens once a month known as “Panda refresh” which aims to lower the ranking of sites with thin content and having to many ads.