Google says every page you care about should have a link from at least one other page on your site, and that it uses links to judge relevancy and to find new pages to crawl.
https://developers.google.com/search/docs/crawling-indexing/links-crawlableThe full answer on internal and outbound linking is on the blog:
https://aiwebpageseo.com/blog/purpose-of-internal-linking-in-seoHow do you plan internal links on your own site, and have you found orphan pages during an audit?
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