Location
Google uses your location to personalize the results for searches with local intent. That’s why all results for “italian restaurant” are from or about local restaurants. Google knows you’re unlikely to fly halfway around the world for lunch.
Language
Google knows there’s no point in showing English results to Spanish users. That’s why it ranks localized versions of content (if available) to users who speak different languages.

Search history
Google saves the things you do and places you go to give you a more personalized search experience. You can opt out of this, but most people probably don’t.
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