Ranking Changes

I can suddenly see a drastic changes in the google search results.Most of the ranking sites are falling back suddenly.This is happening for multiple search terms.Is there any new update that google rolled out or is there any change made to algorithm?

https://www.semrush.com/sensor/

This is a good free tool to check for niche wide changes. The answer is yes.

If you ranking changes that doesn't mean Google is updating algo.