Definition
Trust is how credible a website or a piece of content appears to search engines, AI systems, and the people reading it. Search engines cannot personally verify facts, so they rely on measurable signals, such as who else links to a site, how secure it is, and how consistent its information is across the web, to estimate how much that content deserves to be trusted.
User Cases
A health website adds author bios with medical credentials to increase trust with readers and search engines alike. An online store installs a security certificate so customers see a padlock icon at checkout instead of a warning. A nonprofit gets mentioned by established news outlets, and those mentions strengthen how trustworthy the organization looks to search engines evaluating its site. In each case, trust is being built through visible, checkable signals rather than through claims alone.
Why It Matters for SEO
Trust plays an outsized role for topics that affect a person’s health, finances, or safety, a category search engines treat as YMYL and evaluate with extra scrutiny. Two of the clearest trust signals are domain authority, which reflects how credible an entire site is based on its link profile and history, and trust signals more broadly, which include everything from secure connections to consistent business information across the web.
Related Concepts
Trust is closely related to brand authority, the recognition and credibility a brand builds over time both on and off its own website. A strong brand often earns trust faster than an unknown site, even when the underlying content is similar.