Google Dance is a slang term for the behavior of the Google search engine where identical search terms can show different search results. This is due to the delay in data processing on the part of the company’s servers.
Why is this happening? It’s no secret that Google regularly indexes web pages using autonomous systems. Since a single server cannot cope with this, it was decided to distribute the load across several autonomous data centers, each of which owns its database. The database index of each server is updated at regular intervals independently of one another. Such updates often occur with a time lag between separate databases and can lead to differences in indexes of different servers at a certain point in time. Because a user may be accessing different datacenters when entering a search query, search results may vary.
Therefore, the owners of Internet resources should be prepared that the ranking of their site in the search engine may fall or rise for no particular reason. You should not panic in such cases, because after a while everything will return to its original place.
Fortunately, Google is constantly updating its system, and if according to the old algorithms the update took place every month, causing big bugs, now it happens almost constantly.
