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Duplicate Content: Types, Algorithms, and Optimization Methods (Part 1) – SEO & Engine News

Duplicate Content: Types, Algorithms, and Optimization Methods (Part 1) – SEO & Engine News

Duplicate content on the internet is a problem as old as the web itself. An absolute ease of copying (or even looting) of content specific to the web space multiplied by constellations of non-optimized technical solutions such as tracking parameters or human errors generates billions of duplicate pages alongside already existing pages. This makes it one of the priority tasks to be managed by search engines. And as usual, what Google wants inevitably affects the work of SEO managers. In this two-part article, we will review the different types of duplicate content, the detection algorithms and the particularities of processing duplicate content by Google, the methods and tools to identify it and of course to correct it.

What is duplicate content?

Let’s start with the definition of duplicate content and for that let’s take the official explanation from Google :

” By duplicate content, we generally mean large blocks of content, belonging to the same domain or spread over several domains, which are identical in the same language or substantially similar. In most cases, these contents are not originally misleading. »

Based on this definition, we can easily come up with some duplicate content typologies.

Depending on where the duplicate content appears, we can have:

  • Internal duplicates (the duplicated page is within the same site).
  • External duplicates (the duplicated page is on another site, another domain name).

Depending on the rate of similarity, we distinguish:

  • Complete duplications (“exact duplicate”).
  • Partial duplications (“near duplicate”).

Depending on the nature of the duplications:

  • Voluntary and misleading duplications.
  • Unintentional or accidental duplications.

To these three types of duplications, we can add a 4th :

  • Technical duplicates.
  • Semantic duplications (pages that use different words and turns of phrase, but ultimately talk about exactly the same thing without added value).

Depending on the type of duplication, the severity, reaction and correction methods will not be the same. This is what we will see later in this article.

How does Google identify duplicate content?

For search engines, the comparison of web documents with the aim of identifying duplicates is always a matter of compromise between accuracy and machine resources consumed.

Many algorithms that are at our disposal and that we can use without any problem for our projects, prove very quickly ineffective at the scale of the Web when it is necessary to carry out the comparison with millions, even billions of Web pages.

To identify if a site contains duplicate content, Google uses multiple tiersanalysis methods and algorithms.

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