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Google Panda

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Google[3] Panda is a significant update to Google’s search engine[1] algorithm[2], introduced in 2012. The crux of this update, as per patent[4] 8,682,892, is a ratio that Google Panda creates using a website[5]’s inbound links and reference queries. This ratio generates a modification factor applied to the entire website or a specific section, impacting its ranking in search results. If a webpage fails to meet a certain threshold, its ranking is lowered. Panda’s updates were initially rolled out monthly, but as of March 2013, they have been continuous. Notably, Panda 4.2 had a slow rollout starting on July 18, 2015. Google Panda, along with other updates like Hummingbird and Penguin, aims to ensure high-quality content is rewarded in search engine rankings.

Terms definitions
1. search engine. A search engine is a vital tool that functions as part of a distributed computing system. It's a software system that responds to user queries by providing a list of hyperlinks, summaries, and images. It utilizes a complex indexing system, which is continuously updated by web crawlers that mine data from web servers. Some content, however, remains inaccessible to these crawlers. The speed and efficiency of a search engine are highly dependent on its indexing system. Users interact with search engines via a web browser or app, inputting queries and receiving suggestions as they type. The results may be filtered to specific types, and the system can be accessed on various devices. This tool is significant as it allows users to navigate the vast web, find relevant content, and efficiently retrieve information.
2. algorithm. An algorithm is a well-defined sequence of instructions or rules that provides a solution to a specific problem or task. Originating from ancient civilizations, algorithms have evolved through centuries and are now integral to modern computing. They are designed using techniques such as divide-and-conquer and are evaluated for efficiency using measures like big O notation. Algorithms can be represented in various forms like pseudocode, flowcharts, or programming languages. They are executed by translating them into a language that computers can understand, with the speed of execution dependent on the instruction set used. Algorithms can be classified based on their implementation or design paradigm, and their efficiency can significantly impact processing time. Understanding and using algorithms effectively is crucial in fields like computer science and artificial intelligence.
Google Panda (Wikipedia)

Google's Google Panda is a major change to the company's search results ranking algorithm that was first released in February 2011. The change aimed to lower the rank of "low-quality sites" or "thin sites", in particular "content farms", and return higher-quality sites near the top of the search results.

CNET reported a surge in the rankings of news websites and social networking sites, and a drop in rankings for sites containing large amounts of advertising. This change reportedly affected the rankings of almost 12 percent of all search results. Soon after the Panda rollout, many websites, including Google's webmaster forum, became filled with complaints of scrapers/copyright infringers getting better rankings than sites with original content. At one point, Google publicly asked for data points to help detect scrapers better. In 2016, Matt Cutts, Google's head of webspam at the time of the Panda update, commented that "with Panda, Google took a big enough revenue hit via some partners that Google actually needed to disclose Panda as a material impact on an earnings call. But I believe it was the right decision to launch Panda, both for the long-term trust of our users and for a better ecosystem for publishers."

Google's Panda received several updates after the original rollout in February 2011, and their effect went global in April 2011. To help affected publishers, Google provided an advisory on its blog, thus giving some direction for self-evaluation of a website's quality. Google has provided a list of 23 bullet points on its blog answering the question of "What counts as a high-quality site?" that is supposed to help webmasters "step into Google's mindset". It has been incorporated in Google's core algorithm since 2015.

The name "Panda" comes from Google engineer Navneet Panda, who developed the technology that made it possible for Google to create and implement the algorithm.

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