What is Google Phantom Update about?

Google's Phantom update was a sneaky change to the company's search algorithm that affected mostly informational sites like eHow, Quora, and HubPages. Many sites lost rankings while others jumped ahead, causing mass confusion among webmasters as Google originally denied a major update.

Google’s Phantom update is also known as “Quality Update”.

According to the top SEO services in India, After many reports of large-scale ranking changes, originally dubbed "Phantom 2", Google on May 3, 2015 acknowledged a core algorithm change impacting "quality signals". Google Phantom 2 algorithm assesses content quality on a website. This update seems to have had a broad impact, but Google didn't reveal any specifics about the nature of the signals involved.