Algorithms updates

Each year, Google changes its search algorithm around 500–600 times. While most of these changes are minor, Google occasionally rolls out a "major" algorithmic update (such as Google panda and Google penguin) that affects search results in significant ways.
Panda :
launched:  2011

goal: de-rank sites with low-quality content
Duplicate content
Thin content
User-generated spam
Keyword stuffing
Poor user experience
Penguin: 2012
Goal: de-rank sites with spammy, manipulative link profiles
Links coming from poor quality, "spammy" sites
Links coming from sites created purely for seo link building (pbns)
Links coming from topically irrelevant sites
Paid links
Links with overly optimized anchor text
Pirate : 2012

goal: de-rank sites with copyright infringement reports
Pirated content
High volume of copyright infringement reports
Goal: prevent poor quality sites from ranking
New site with poor content
Humming bird:  - 2013
Goal: produce more relevant search results by better understanding the meaning behind queries
Exact-match keyword targeting
Keyword stuffing
Domain crowding  -  2013
Goal :to prevent series of multiple results from the same domain filling up the entire serp
Results will not take from the same domain appearing here and there
If you don’t  find what your looking for the first results and the next result is the same site and the next, and the next
Goal:    traditional spamming quarries
Pornographic and heavy spammed quarries
Pigeon: 2014
Goal: provide high quality, relevant local search results
Poorly optimized pages
Improper setup of a google my business page
Nap inconsistency
Lack of citations in local directories (if relevant)
Mobile friendly updates: 2015
Goal: give mobile friendly pages a ranking boost in mobile serps, and de-rank pages that aren't optimized for mobile
Lack of a mobile version of the page
Improper viewport configuration
Illegible content
Plugin use
Rankbrain: 2015
Goal: deliver better search results based on relevance & machine learning
Lack of query-specific relevance features
Poor user experience
Possum: 2016
Goal: deliver better, more diverse results based on the searcher's location and the business' address
Sharing a physical address with a similar business
Competitors whose business address is closer to the searcher's location
Fred:  2017
Goal: filter out low quality search results whose sole purpose is generating ad and affiliate revenue
Low-value, ad-centered content
Thin, affiliate-heavy content
Broad core algorithm update —  march - 2018
What google says about the mar -12 algorithm update
Google has confirmed that they ran a “broad core algorithm update” last week that has impacted the appearance and rankings of some websites in the search results.
Page rank: page rank is an algorithm used by google search to rank websites in their search engine results
Page rank is a way of measuring the importance of website pages
Page rank works by counting the number and quality of links to a page to determine a rough estimate of how important the website is. The underlying assumption is that more important websites are likely to receive more links from other websites
Knowledge graph:
Which will help you discover new information quickly and easily. Summarize relevant content around that topic,
Freshness updates:
 google search uses a freshness algorithm, designed to give the most up-to-date results, so even when just type [olympics] without specifying 2012, still find what your looking for.
Snippets :
Prioritized snippet oriented sites
Spell heck :
Helps to provide with correct keywords
Synonyms check:
Helps to provide with similar word and synonyms
Auto complete :
Help to user with auto complete when customer type any word
User context :
Discover the result based on user context
Safe search :
Restrict the violent and adult content
Google instant :
Provide instant result
From millions of you can get proper one
Answer :
Work on question and answer related quarries

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