Perplexity AI

What is Perplexity AI?

Perplexity AI is an AI search engine that combines live web retrieval with LLM-generated answers. What sets Perplexity apart from most competitors is the explicit, clickable source links that are displayed prominently in the interface.

How Perplexity works

1. A user asks a question
2. PerplexityBot retrieves from 4–8 relevant web pages
3. Perplexity synthesizes an answer from the sources
4. Answers appear with numbered source links the user can click

What Perplexity prioritizes

• Direct answerability: Passages that precisely answer the question
• Factual grounding: Concrete numbers and specific claims are cited more often
• EEAT: Credible, expert content from identified authors
• Fresh content: Live crawling favors recently updated content

Technical requirements

Explicitly allow PerplexityBot in robots.txt:

User-agent: PerplexityBot
Allow: /

Optimization actions

1. robots.txt: Allow PerplexityBot
2. FAQPage schema: Each question-answer pair is independently citable
3. Passage optimization: Identify your strongest passages (100–200 words, under a question-based heading)
4. Updates: Refresh key content regularly
5. Fact-based content: Concrete numbers and attributed claims

Traffic from Perplexity

Perplexity is the AI search engine that consistently drives the most referral traffic. Site owners report growing Perplexity referral traffic in Google Analytics.

Growth figures (2026)

• 100M+ daily queries (Q4 2025)
• Valuation: $9B+
• Growth: 200%+ year-over-year

FAQ

What is PerplexityBot? PerplexityBot is Perplexity AI’s web crawler. It fetches web content for live search grounding. User-agent: PerplexityBot. It respects robots.txt.

Does Perplexity always provide source links? Yes — explicit source links are a core feature of Perplexity. It’s one of the reasons Perplexity is the AI search engine that drives the most referral traffic.

What is Perplexity Pro? Perplexity Pro is the paid version, which provides access to GPT-4, Claude, and Gemini as underlying models, plus unlimited searches.