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These are the topics as assigned by Majestic.com. They are derived automatically based upon the types of backlinks a domain has pointing towards it.
In order to improve the authority of a site on a particular topic, it is recommended to have backlinks from sites with close topics. The fact of working with a qualitative netlinking, by carefully choosing the sources, improves understanding by the search engines and therefore the relevance for ranking in the SERPs on the various targeted keywords.