If you’ve ever lost rankings or organic traffic as the result of a Google update (and if you’ve been practicing SEO for longer than a few years, you probably have), you probably have an understandably negative association with search engine algorithm updates. Even if you’ve never been significantly affected by such an update, you’ve read the horror stories, and you know the potential turbulence that Google updates like Panda, Penguin, and Pigeon can cause.
Source: Technology