What is Citations in AI?
A citation in AI is when an answer engine explicitly names or links to your site as the source of a fact or claim in its response — functionally the AI-era equivalent of a backlink, and the clearest, most attributable form of GEO success.
When Perplexity, Google AI Overviews, or ChatGPT's search mode answer a question, they typically attribute specific claims to specific sources — a numbered footnote, an inline link, a "according to X" phrase. That attribution is a citation, and it's the single most concrete unit of GEO success: it means the retrieval system found your page, judged it relevant and trustworthy enough to quote, and surfaced it to a real user.
Citations matter for two separate reasons. Directly, a cited link can still drive a click, especially from engines like Perplexity where the citation UI is prominent. Indirectly, being cited repeatedly across many prompts and engines reinforces a brand's standing in whatever retrieval index or knowledge graph those systems maintain, similar to how repeated high-quality backlinks compound into domain authority in classic SEO.
Not every mention is a citation — an engine can name your brand from memorized training data with no link at all, which is a weaker, unattributed form of visibility. GEO programs typically track both: citations (attributed, linked) and mentions (named but not linked), since both feed share of voice but only citations are directly attributable to a specific page.