What is Co-Citation?
Co-citation refers to the occurrence of two or more websites being mentioned or cited together on a third-party webpage.
This happens when two websites are both cited as a source of information or recommendation on a particular topic or subject matter, even if they are not directly linked to each other.
For example, if Website A and Website B are both mentioned on a third-party webpage as reputable sources of information on a specific topic, this creates a co-citation relationship between Website A and Website B.
Co-citation is important in search engine optimization (SEO) because it can indicate to search engines that the two websites are related or have a certain level of authority on a particular topic.
Co-citation vs co-occurrence
In the context of SEO, co-citation and co-occurrence are two concepts that are often used to analyze the relationships between web pages and keywords.

This tweet from Bill Slawsky in response to Neil Patel’s tweet clearly tells us the fact that they both should not be used interchangeably.
Co-citation in SEO refers to the frequency with which two web pages are linked to by a third-party website.
This indicates that the two web pages are seen as related by other websites and are therefore likely to be on a similar topic.
Co-citation analysis is often used to identify the most important web pages in a particular field, as well as to identify the intellectual structure of a field by revealing clusters of web pages that are frequently linked together.
On the other hand, co-occurrence in SEO refers to the frequency with which two or more keywords appear together on a web page or across a set of web pages.
This indicates that the keywords are related in some way and are therefore likely to be on a similar topic.
Co-occurrence analysis is often used to identify the main topics in a field, as well as to identify the relationships between different topics.
Co-citation and co-occurrence principles can significantly improve content creation for better SEO.
Content creators should go beyond mere keyword research and embed related terms and modifiers to promote co-occurrence.
When writing, authors should also integrate authoritative mentions and related key phrases that are likely to be linked or cited together by other sources to improve co-citation.
By aligning content creation with co-occurrence and co-citation strategies, content creators can improve their work's performance in search results - making it more visible and impactful.
Importance of co-citation
Co-citation is important in SEO because it is a way of measuring the perceived authority and relevance of a web page based on its relationships with other web pages.
When a web page is frequently cited along with other authoritative pages in the same field, search engines may interpret this as an indication of the page's quality and relevance.
Therefore, co-citation analysis can help SEO practitioners identify the most authoritative and relevant sources in a particular field and understand the relationships between them.
By creating content that is cited alongside these authoritative sources, webmasters can increase the perceived authority of their own pages and improve their search engine rankings.
Co-citation analysis can also be used to identify opportunities for link-building.
By identifying websites that frequently cite authoritative sources in a particular field, SEO practitioners can target these websites for outreach and potentially earn links from them, which can further improve their own website's authority.
Is co-citation a ranking factor?
According to some SEOs, co-citation is not a direct ranking factor in search engine algorithms.
However, co-citation analysis can indirectly influence search engine rankings by providing insights into the authority and relevance of web pages based on their relationships with other web pages.
When a web page is frequently cited alongside other authoritative pages in the same field, search engines may interpret this as an indication of the page's quality and relevance.
As a result, the page may be considered more authoritative and relevant, which can potentially improve its search engine rankings.
However, if we look at the most authentic and reliable sources to validate this information, it is clearly not like that. As Bill Slawsky tweeted a reply:

Keeping this in mind, it must be taken as something that does not need to be given as much attention as the other crucial SE factors.
Ways to incorporate co-citation analysis into improving your online presence
Here are some ways to incorporate co-citation analysis into improving your presence on search engines:
Identify authoritative sources
Use co-citation analysis to identify the most frequently cited and authoritative sources in your field.
This can help you understand the topics that are most important to your audience and create content that is more likely to be perceived as relevant and authoritative.
Create link-worthy content
Create high-quality, informative content that is likely to be cited and linked to by other websites.
This can include original research, in-depth guides, and other types of content that provide value to your audience.
Outreach to websites
Reach out to websites that frequently cite authoritative sources in your field and offer them your own content as a potential resource.
This can help you earn links from these websites, which can further improve your own website's authority and search engine rankings.
Monitor co-citation patterns
Monitor co-citation patterns for your own website and your competitors to understand the relationships between web pages in your field.
This can help you identify new opportunities for link-building and content creation.
Collaborate with other websites
Collaborate with other websites in your field to create content that is likely to be cited and linked to by other websites.
This can help you build relationships with other authoritative sources and improve your own website's authority and relevance.
Avoid using anchor text with many keywords
Instead of using exact-match keywords as anchor text for your links, use more natural language that accurately describes the content on the linked page.
This can help you avoid penalties for over-optimization and improve the perceived relevance and authority of your web pages.
Write according to the users
Create content that answers the questions and addresses the concerns of your target audience.
Use language that your audience is likely to use when searching for information on your topic.
This can help you improve the relevance and quality of your content, which can, in turn, improve your search engine rankings.
Utilize content marketing
Invest in creating high-quality, informative content that provides value to your target audience.
Share this content on social media and other channels to increase its visibility and reach.
This can help you earn links and social shares, which can further improve your search engine rankings.
Build a natural link profile
Instead of trying to manipulate search engine rankings with spammy or low-quality links, focus on building a natural link profile that includes a variety of high-quality links from diverse sources.
This can help you avoid penalties and improve the perceived authority and relevance of your web pages.
Conclusion
Co-citation analysis can be a valuable tool for SEO practitioners looking to improve their website's authority and relevance on search engines.
While co-citation is not a direct ranking factor, it can provide valuable insights for SEO practitioners and potentially influence search engine rankings indirectly.
By analyzing the relationships between web pages in a particular field, SEO practitioners can identify authoritative sources, create link-worthy content, and earn links from other authoritative websites.