I've had to reject and roll back a lot of tag wiki entries, and I'd like to explain what we are looking for.
See Improved Tagging.
Tag wikis are about why you would use a tag. Tag wikis are not to define the term being used. Avoid generically defining the concept behind a tag, unless it is highly specialized.
This tag wiki except doesn't work…
A résumé is a list of credentials given to a prospective employer that clearly lays out your education, skills and abilities.
This is better…
For questions about advancing one's career as a whole rather than working in a specific job function or company.
The “resume” tag does not need to explain what a resume is. I think we can safely assume most users of this site know what a resume is; there’s no value in a boilerplate explanation. Add, instead, why a user would use this tag.