The Search Terms link in the footer of your store displays the search terms used by visitors to your store, ranked by popularity. Search terms appear in a tag cloud format, where the size of the text indicates the popularity of the term.
By default, Popular Search Terms is enabled as a search engine optimization tool, but has no direct connection to the catalog search process. Because the Search Terms page is indexed by search engines, any terms on the page can help improve your search engine ranking and the visibility of your store. The URL of the Popular Search Terms page is:
Popular Search Terms
Configure Popular Search Terms
On the Admin sidebar, go to Stores > Settings > Configuration.
In the left panel, expand Catalog and choose Catalog underneath.
Expand the Search Engine Optimization section.
Set Popular Search Terms as needed.
If needed, clear the Use system value checkbox to change this setting.
When complete, click Save Config.
You can further configure the caching of popular [catalog searches(/user-guide/catalog/search-configuration.html).