"However, you don't necessarily have to wait for a major core update to see the effect of your improvements. We're continually making updates to our search algorithms, including smaller core updates. These updates are not announced because they aren't widely noticeable, but they are another way that your content can see a rise in position (if you've made improvements)."
"Broad core updates tend to happen every few months. Content that was impacted by one might not recover - assuming improvements have been made - until the next broad core update is released. However, we're constantly making updates to our search algorithms, including smaller core updates. We don't announce all of these because they're generally not widely noticeable. Still, when released, they can cause content to recover if improvements warrant."
Google updated its core update documentation to state that it continually makes smaller, unannounced core updates that can affect website positions in search results. The documentation clarifies that site owners who improve content can see ranking improvements without waiting for a major confirmed core update. Google reiterated that these smaller updates are generally not announced because they are not widely noticeable, yet they can enable content recovery when improvements warrant. John Mueller indicated that a larger, confirmed core update may be expected soon, and many unconfirmed ranking fluctuations may stem from smaller or other unannounced algorithm changes.
Read at Search Engine Roundtable
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