Depending on the chosen plugin, related posts will be displayed:
– if you select Category option – related post will be displayed by similar words in categories;
– if you select Tags option, related post will displayed by similar words in tags;
– if you select Title option, related post will displayed by similar words in title of the posts and pages;
– if you select Meta Key option, related post will be displayed by meta key.
This article related to Relevant plugin
Additional resources: Relevant - User Guide
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