Content Spinning is the technique of spinning editorial content in all directions to get different texts talking about the same thing.
Its goal is to obtain a multitude of variations of a starting text and to use it to feed different pages of a site or different sites without these variations being seen as the product of duplicate content or of plagiarism.

It is tedious and expensive to create editorial content that has the same meaning but has to be different enough from each other to avoid the thunderbolt of search engine bots who do not like everything to do with cheating.
This is the reason why specialists have invented a solution making it possible to ensure that the writer has to write only one text and to foresee the synonyms of the words used as well as all the possible turns and substitutions and that in A plurality of texts emerge which are different in terms of formulation but practically identical in terms of meaning. It is all the work of the writer and that of a spinning software that constitutes this solution which is called
content spinning . From “The life of men is experienced by sensations” one could obtain “The feelings are at the base of the human experience” and this would be only one of ten or even fifteen possible variations.
Badly developed by the editor, however, the masterspin, that is to say the content to be spun, can degrade into spinned or spun texts of low quality, sources of confusion for the engines and sources of disappointing experience for the readers.
The technique must be framed by a content strategy so as not to sabotage the seriousness of the site.

Rather considered a black hat practice, that is to say unethical in the world of SEO, and moreover little appreciated by search engines,
content spinning is akin to an industrial production technique of texts. for site managers and a soulless fill technique for writers and readers. However, we can say that this is no longer the case when the technique is associated with the intervention of the editor who judges and improves the ground texts.
For hundreds or thousands of texts produced as is often the case in e-commerce and for pages devoted to geolocation, the gain is significant since the editor spends up to ten times less time by becoming more proofreader and quality is assured. Although he does not use his inspiration to produce countless texts meaning the same thing, he enriches and personalizes them easily when they come out of a powerful spinner.
However, he will pay particular attention to footprints which are sections of sentences that remain unchanged from one URL to another.
The ideal compromise is there.
According to the experience of SEO specialists, when there is less than 20% similarity between texts, Google's Panda continues its path and the search engine takes them into account in its indexing.
For a good result, it is also necessary to start from a masterspin with enough depth.

Duplicate content, which in French means “duplicated content”, refers to the content of a web page or a website which is reproduced almost identical or almost on the Web.
This is a phenomenon that poses a problem in terms of SEO because search engines track down and sanction the pages or sites affected by duplicate content.

This can be textual content alone on a paragraph or textual content with other elements on an entire page.
When such content is picked up for publication on another URL, without or with a slight modification, it is considered duplicate content and it is the search engine that makes this “judgment”.
There are two types of duplicate content.
The first concerns duplicate pages within the same site, on different URLs therefore, due either to the need to make a desktop version and a mobile version of a site separately, or because of a technical error. or the webmaster. There, the contents are perfectly identical. This often happens on e-stores with their product sheets. The second concerns duplicate pages on different sites.
It can be the result of a redistribution of RSS feeds or that of an almost identical description of a similar product or quite simply the fact of plagiarism.
It is a very feared phenomenon among website owners.
However, sometimes it is intentional, because necessary, to let the duplicate content persist, in which case it suffices to indicate the source content to the Google robot by the use of the rel = canonical tag and it is the page considered as original which will be indexed.

You should first know that except in the most severe cases, the phenomenon of duplicate content does not prevent the Google search engine from indexing the pages concerned.
Google is just trying not to outperform a site by considering the same content multiple times.
What happens to pages classified as
duplicate content is losing SERP positions or even being removed from search results.
It also happens that an original page is relegated to the background in favor of the content thief when the latter's PageRank is stronger.
Apart from the 2 types of
duplicate content , there are 3 cases.
The first relates to strictly identical pages.
There, only the one with the highest PageRank will be indexed.
The second relates to pages that are similar but differentiated by their Title and Description tags.
There, all the pages will be indexed but those which are not considered as the original will only appear in the SERPs by clicking on “relaunch the search including the skipped pages”.
The third is for the same Title and Description tags for different pages.
There, Google can go so far as not to index the pages considered to be duplicated.
The rules to remember are: one page = a separate URL and in case of intentionally duplicated content, put the URL of the original page in the canonical tag.