It is used to build and maintain lists of pages—primarily for the sake of the lists themselves. They are not part of the encyclopedia's categorization scheme. Per consensus at Template talk:Infobox mountain, Wikidata values are to be enabled only after checking each article. This tracking category is used to keep track of articles that contains an unpopulated local parameter, which could otherwise be populated with a value from Wikidata.
Before Wikidata could be enabled for {{Infobox mountain}} (by changing |fetchwikidata={{{fetchwikidata|NONE}}} to |fetchwikidata={{{fetchwikidata|ALL}}}, and removing |replacetext={{#ifeq:{{{fetchwikidata|}}}|ALL||[[Category:Wikidata value to be checked for Infobox mountain]]}} for all parameters), each of the articles in this category must first be cleared manually.
To process articles in this category:
Open an article
Add |fetchwikidata=ALL to the infobox, and preview the result
Check if the Wikidata values are accurate
Values from Wikidata could be identified when there is no local value set, but a value is showing in the infobox
Wikidata values should also have a pen icon at the suffix of the shown value
Consider saving the reference you used, to Wikidata
Save the article (with |fetchwikidata=ALL)
This will show the Wikidata values, and remove the article from this tracking category.
Once all entries are cleared, and Wikidata is enabled for {{Infobox mountain}}, the |fetchwikidata=ALL in each article becomes obsolete, and can be eventually removed.
These categories are used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.
These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).
Pages in category "Wikidata value to be checked for Infobox mountain"
The following 27 pages are in this category, out of 27 total.
