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The Art of SEO (Theory in Practice) Highlight

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To measure these factors, search engines perform document analysis (including semantic analysis of concepts across documents) and link (or citation) analysis.

— Eric Enge, Stephan Spencer, Jessie Stricchiola, and Rand Fishkin

Replicated under Fair Use from The Art of SEO (Theory in Practice) by Eric Enge, Stephan Spencer, Jessie Stricchiola, and Rand Fishkin.