Content Quality Signals Explained

What is this page about?

An explainer of the content quality signals search engines reward, opening with Google's 2018 Medic update that penalized unsigned, uncredentialed, poorly sourced health sites while rewarding credentialed institutional ones. It covers the E-E-A-T framework (experience, expertise, authoritativeness, trustworthiness) in depth, what comprehensive content means (subtopic coverage, semantic depth), evidence and citation, user-behavior signals like satisfaction and click-through, and practical quality improvement via content audits, authorship infrastructure, and the helpful-content framework.

What has been corrected on this page?

Every accepted correction to this page is recorded with the exact change, so readers can see how the page improved over time.

1. 11 July 2026 · corrected by Melik Can Sariyer

   The August 2018 Google core update communications were authored by Danny Sullivan (Google's Search Liaison), not 'Danny Roth.'

   Before

   Roth, Danny. "More details about the August 2018 core algorithm update."

   After

   Sullivan, Danny. "More details about the August 2018 core algorithm update."

   Why: The August 2018 Google core update communications were authored by Danny Sullivan (Google's Search Liaison), not Danny Roth. Verified fix already live in bibliography; no leftover instances found in faq/excerpt/meta.

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