Google Algorithm is set of code or system which particularly used to retrieve data form its search index & provides best possible results for queries. The best links relating to your search query are theoretically the first ones Google lists.

1. HOW GOOGLE SEARCH EVOLVED IN LAST 5 YEARS?

2. What is Google Algorithm?
How does Google Algorithm Works?
Major Google Algorithms
Google Algorithm Update 2015
Google Algorithm Update 2016
Google Algorithm Update 2017
Google Algorithm Update 2018
Google Algorithm Update 2019

3. What is Google Algorithm?
■ Google Algorithm is a set of code or
system which is particularly used to
retrieve data form its search index &
provides best possible results for
queries.
■ In other words, it is a series of
algorithm that analyzes what you
have searched or looking for and
what information to return you.

4. ■ Google Algo searches web
pages that contain the
keywords you used to
search, then assigning a
rank to each page based
several factors, including
how many times the
keywords appear on the
page.
■ The best links relating to
your search query are
theoretically the first
ones Google lists.

5. Google Search Algorithm can be broken into 5 major parts:
■ Word Analyzing : Google strives to understand what you are searching for to provide
you better results. For example, our synonym system helps Search know what you
mean, even if a word has multiple definitions.
■ Search Match : Google looks for webpages that match your query. It does this by
looking up your terms in the index & searching for websites that most closely match
the information you require. This is done by analyzing details such as whether the
keyword appears in titles or headings and how often it appears on a page.
■ Ranking Pages : When searching for a typical query, there to be tens of millions of
websites with relevant information. So, to ensure that Google provides the best
results, its algorithms get to work.
■ Context Matters : Not everyone is served with the same search results, even if they
search for the same keywords. A variety of factors –past search history, search
settings, & location – all come into play when generating results.
■ Returns to Best Result : Before you are served any results (which is done almost
instantaneously), Google evaluates the search terms as to provide the most helpful
information.

7. Major
Google
Algorithms
Panda : Duplicate, plagiarized or thin content; user-generated spam;
keyword stuffing
Penguin : Spammy or irrelevant links; links with over-optimized anchor
text, to down-rank sites whose links it deems manipulative.
Hummingbird : Keyword stuffing; low-quality content. Helps Google better
interpret search queries and provide results that match searcher intent.
Pigeon : Poor on- and off-page SEO. Affects those searches in which the
user’s location plays an important part.
Mobile : Lack of a mobile version of the page; poor mobile usability.
Ensures that mobile-friendly pages rank at the top of mobile search.
RankBrain : Lack of query-specific relevance features; shallow content;
poor UX
Fred : Thin, affiliate-heavy or ad-centered content. Fred targets websites
that violate Google’s webmaster guidelines.

8. 2015 Updates
■ RankBrain* — October 26, 2015
Google made a major announcement, revealing that machine learning had
been a part of algorithm for months, query specific relevant
features. Machine-learning artificial intelligence system helps Google
process some of its search results, in particular rare or one-of-a-kind queries.
■ Panda 4.2 (#28) — July 17, 2015
Focused on spammy links & low quality content to provide relevant & high
quality content.
■ The Quality Update — May 3, 2015
Google acknowledged a core algorithm change impacting "quality signals"
in terms of how it processes quality signals.

9. Mobile Update AKA "Mobilegeddon" — April 22, 2015
Google pre-announced an algorithm update, telling us that mobile
rankings would differ for mobile-friendly sites starting on April 21st. The
impact of this update was, in the short-term, much smaller than
expected, and our data showed that algorithm flux peaked on April
22nd.

10. 2016 Updates
■ Penguin 4.0, Phase 1 — September 27, 2016
Penguin algorithm, penalizing bad links instead of penalizing sites for high
quality backlinks.
■ Penguin 4.0 Announcement — September 23, 2016
After almost 2 years of waiting, Google finally announced a major Penguin
update. They suggested the new Penguin is now real-time and baked into the
"core" algorithm. Initial impact assessments were small, but it was later
revealed that the Penguin 4.0 rollout was unusually long and multi-phase.
■ Mobile-friendly 2 — May 12, 2016
Just more than a year after the original "mobile friendly" update, Google rolled
out another ranking signal boost to benefit mobile-friendly sites on mobile
search. Since the majority of sites we track are already mobile-friendly, it's
likely the impact of the latest update was small.

11. 2017 Updates
■ Intrusive Interstitial Penalty — January 10, 2017
Penalty to punish pop-ups that might damage the mobile user
experience.
■ Fred Update — March 9, 2017
Thin, affiliate-heavy or ad-centered content. Fred targeted content sites
having large amount of Ads, which were created to generate revenue
only instead of resolving user problems.
■ Google Jobs — June 20, 2017
Google officially launched their jobs portal, including a stand-alone 3-
pack of job listings in search results. These results drew data from
almost all of the major providers, including LinkedIn, Monster,
Glassdoor, and CareerBuilder.

12. ■ Chrome Security Warnings (Forms) — October 17, 2017
Not an algorithm update, this was an important step in Google's push toward HTTPS
and may have a material impact on site traffic.
■ Snippet Length Increase — November 30, 2017
Google increased them across a large no. of results. This led us to adopt a new Meta
Description limit -- up to 300 characters from the previous 155 (almost doubling).

13. 2018 Updates
■ "Brackets" Core Update — March 8, 2018
Focused heavily on content quality, which we know is an important factor
for Google. Main impact of this update is how it impacts which sites are
appearing in the rich snippets. Rich snippets are known for having a
higher click-through with more quality information.
■ Zero-result SERP Test — March 14, 2018
Including some time/date queries and unit conversion calculators,
Google started displaying zero organic results and a "Show all results"
button.
■ Mobile-First Index Roll-out — March 26, 2018
The mobile version of your website becomes the starting point for what
Google includes in their index. It’s not a mobile-only index: for instance, if
a site doesn’t have a mobile-friendly version, the desktop site can still be
included in the index.

14. ■ Snippet Length Drop — May 13, 2018
After testing longer display snippets of up to 300+ characters for a few months,
Google rolled back most snippets to the former limit (about 150-160 characters).
■ Video Carousels — June 14, 2018
Google moved videos from organic-like results with thumbnails into a dedicated video
carousel, causing a shake-up in results that were previously tracked as organic.
■ Mobile Speed Update — July 9, 2018
Mobile page speed update, making page speed a ranking factor for mobile results.
Google claimed that this only affected the slowest mobile sites, and there was no
evidence of major mobile rankings shifts.
■ "Medic" Core Update — August 1, 2018
Google confirmed a "broad core algorithm update," with wide reports of massive
impact. It rolled out over the period of about a week, but peaked on August 1-2. This
update seemed to disproportionately affect sites in the health and wellness vertical,
although large-scale impact was seen in all verticals.

15. 2019 Updates
■ March 2019 Core Update — March 12, 2019
Google confirmed a "core" update, stating it was the third major core
update since they began using that label. MozCast hit a peak of
101.2°F, a bit below March 1st temperatures. No specific details were
given about the nature of the update.
■ Deindexing Bug — April 5, 2019
Google confirmed a bug that dropped pages from the search index
around the weekend of April 5th. Moz data suggested drops on April 5th
and 7th, with about 4% of stable URLs falling off of page one. Most sites
recovered soon after.
■ Indexing Bugs — May 23, 2019
The first bug reportedly was preventing new content from being properly
indexed. MozCast confirmed unusually high SERP flux from May 23-25.

16. ■ June 2019 Core Update — June 3, 2019
Google pre-announced a "core" update, but with limited details. Sites impacted in
previous core updates seem to have been affected, in some cases, and some major
UK publishers reported heavy losses. On average, the impact was smaller than the
August "Medic" update, as measured by MozCast.
■ Site Diversity Update — June 6, 2019
Google pre-announced a "site diversity" update, claiming it would improve situations
where sites had more than two organic listings. Moz data showed that, while the
update did marginally improve SERPs with 3-5 duplicate sites on page one, the impact
was relatively small.

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