GLOSSARY TERM
What is Mobile-First Indexing?
Definition
Google's policy of using the mobile version of a website as the primary basis for indexing and ranking. Default for all sites since 2023.
Why it Matters for AI Search
If content is hidden, slower, or missing on mobile, that's what Google sees and ranks. Responsive design with feature parity across breakpoints is no longer optional.
Related Terms
Mobile UsabilityPage Experience SignalAMP (Accelerated Mobile Pages)URL Inspection ToolSERP FeatureRank Tracking
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