PANDA:-

Google Panda is a major change to Google'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.(Thin ,plagiarized, duplicate, punctuation error, grammar content)

How does google panda algorithm work:-

Google Panda stripped search results pages (SERPs) of poorly constructed, spammy content, enabling higher quality websites to rise to the top.

  •        Thin content - Weak pages with very little relevant or substantive text and resources, such as a set of pages describing a variety of health conditions with only a few sentences present on each page.
  •         Duplicate content - Copied content that appears on the Internet in more than one place. Duplicate content issues can also happen on your own website when you have multiple pages featuring the same text with little or no variation.         
  • ·        Low-quality content - Pages that provide little value to human readers because they lack in-depth information.

  •         Lack of authority/trustworthiness - Content produced by sources that are not considered definitive or verified.
  •         Content farming - Large numbers of low-quality pages, often aggregated from other websites.

·        High ad-to-content ratio - Pages made up mostly of paid advertising rather than original content. 

  •         Content mismatching search query - Pages that "promise" to deliver relevant answers if clicked on in the search results, but then fail to do so.