Google Core Update
In one line
A Google Core Update is one of the broad algorithm refreshes Google ships a few times a year — a wide reassessment of site quality and E-E-A-T rather than a fix to a specific issue.
Going deeper
A Google Core Update is one of the broad, pre-announced algorithm refreshes Google rolls out a few times each year. Roll-outs typically run between one and several weeks (recent ones have ranged from about a week to over a month) and reassess site-wide quality and E-E-A-T rather than tweaking any one ranking factor.
If you lose traffic in a Core Update, there is rarely a quick fix. Google itself says the only real response is to make the content overall genuinely better — there is no specific switch to flip.
From a GEO angle, Core Updates matter because the signals they reward are basically the same E-E-A-T family that LLMs lean on when picking which sources to cite. Pages that hold up through a Core Update tend to be the same pages AI feels safe quoting — SEO and GEO line up here.
Sources
Related terms
Google Algorithm Updates
Google algorithm updates are the recurring algorithm refreshes Google rolls out — Core Updates, Helpful Content Updates, Spam Updates and Reviews Updates being the headline families.
SEOE-E-A-T
E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) is Google's four-axis lens for content quality — and the same kinds of signals matter when LLMs decide whom to cite.
SEOHelpful Content Update
The Helpful Content Update (HCU) is Google's algorithm move to reward content built for people and demote thin pages built primarily for search engines.
SEOSERP Volatility
SERP volatility is a measure of how much rankings are shifting compared with a normal day — usually the first signal teams use to spot a Google algorithm update in flight.
GEO·AEOGEO
GEO (Generative Engine Optimization) is the practice of optimizing content and data so that a brand gets cited and recommended inside generative AI search answers like ChatGPT, Perplexity and Google AI Overviews.