The Most Important Google Search Algorithm Updates Of 2015


Here’s our annual infographic showcasing the major changes Google made to their search algorithm over the course of 2015.

We’ve been summarizing Google’s algo updates in infographic form for the past four years now, and we notice that 2011 to 2013 were the “penalty years” when Google was more focused on eliminating spam from their search results – and consequently, the internet as a whole – and bringing errant webmasters and SEO spammers to book. And they’ve largely succeeded in doing that. As a result, there have been progressively less impactful (from an SEO point of view) tweaks in 2014 and 2015. These were the years when they’ve attempted to raise the UX bar, with changes related to speed, snippets, security, and accessibility.

And while Google continues to flush worthless content down the SERP depths, the mainstream business and tech media has joined search marketers in the usual wild speculation and analysis surrounding algo updates. This year, they all got worked up about Mobilegeddon and RankBrain.

If your site or app has been affected by any of these updates, the exact date of impact might vary, because

  1. Google hasn’t announced or acknowledged all of the updates. With Matt Cutts gone, the SEO industry no longer has access to a single point of contact whose word can be taken as final.
  2. Many changes are now rolled out over an extended duration. While some constituent factors of each update might have been permanently integrated into the algorithm, others could have been rolled back.

However, industry experts have confirmed and explained these changes in depth (be sure to take a look at our sources), so pull up your GA to tally the ups and downs or just scroll down and enjoy the show!

The Most Important Google Search Algorithm Updates Of 2015

Like this gifographic? Feel free to embed it on your site! Just copy this code:

Rohan is responsible for project delivery and campaign management at E2M Solutions. He keeps the wheels spinnin' and the beavers grinnin'. He is @searchrook on Twitter.
  • Philip Verghese Ariel

    Hi Rohan,
    Great information you presented here thru this infographic.
    I am so glad to read this and I shared it on my page today with due credit.
    As I mentioned in my note, We the Google users expecting more beneficial changes in the coming years.
    We Wish You and your associates a Great and Profitable New Year 2016.
    Keep Sharing
    Have a Joyous Day.

    Philip Ariel & Associates

  • Nicolas Pustilnick

    Excellent article, I will use your infographic. Cheers

  • Rodolphe Degandt

    The best infographic of the year… amazing animate summury

    good job (I just nedd to translate in french dor my readers)

    • Rohan Ayyar

      Merci, Rodolphe! Please let us know if you need help republishing it. Cheers :)

  • Eva Pettifor

    I love this and will feature it on my website’s blog next Monday, thank you!

    • Rohan Ayyar

      Cheers, Eva!

  • Antigone Angeli

    Hi all. As a non-IT person I have to do a short presentation on the most important Google updates in dec 2015. Any tips or links for my research since everything i come across refers to updates for every month of 2015 except dec!