This page documents a Wikidata policy. It is a widely accepted standard that all editors should normally follow. All changes made to it (except for minor edits such as fixing typos) should reflect consensus. When in doubt, discuss your idea on the project chat.
Edit warring is the repeated reverting of the same edits by multiple users. Continued edit warring can be addressed by protecting the page. Persistent edit warring or edit warring over multiple pages can be addressed by blocks. Administrators should not favor one side over the other, but can factor in the severity of the edit warring and previous blocks for similar behavior.
Reverting vandalism is not edit warring.
Reverting edits by a locally blocked or globally locked/banned editor is not edit warring, but is also not mandatory.