What is a Google core update and why did my traffic drop?
A core update is a broad change to Google's ranking systems, rolled out several times a year and announced in advance. They are not penalties, and understanding that distinction determines how you respond.
What a core update is not. It is not a manual action against your site, and it is usually not a punishment for something you did. Google's consistent framing is that core updates re-evaluate which content best serves a query, and a site can lose visibility without having done anything wrong — because something else was judged to serve the query better, or because how the query is interpreted changed.
Why traffic drops:
Reassessment of relevance. Your page was previously considered the best answer and now something else is.
Intent reinterpretation. Google decides a query wants a different type of result — a video, a product page, a forum discussion — and your format no longer fits.
SERP feature changes. An AI summary, a featured snippet, or expanded ads push organic results down. Traffic falls even at an unchanged rank.
Quality signals reweighted, affecting whole categories of site.
What to do, and the order matters:
Wait. Updates take weeks to roll out fully, and rankings fluctuate throughout. Reacting mid-rollout to volatility that has not settled is the most common mistake.
Confirm it is actually the update. Check whether the drop aligns with the rollout dates, and whether it is sitewide or confined to particular pages, queries or countries. Also rule out tracking breakage and seasonality — a surprising proportion of "algorithm drops" are analytics problems.
Identify which queries lost, then compare your page against what now ranks. The gap is usually visible.
Google's own advice is a set of self-assessment questions about content quality rather than technical fixes, and it explicitly says there is nothing specific to fix.
Recovery typically requires substantive improvement, and often appears only at a subsequent update.