An edit war occurs when editors who disagree about some aspect of the content of a page repeatedly override each other's contributions, rather than try to resolve the disagreement by discussion.
Edit warring is nonconstructive and creates animosity between editors, making it harder to reach a consensus as to the right way to improve the wiki.
Solution
If edit warring is persisting to a detrimental extent, the page is to be protected from editing until further notice. The users in question are encouraged to reach an agreement via civil discussion. In the event they don't and communication breaks down further, punishment may be enforced.
During the time that a page is protected, Bureaucrats and Administrators alike may edit the article to assist in ending the edit war.