Revisions
No fear of overwriting
Every change to a piece of content is saved as an earlier version (a revision). So nothing is lost, and no one has to hesitate to change something for fear of destroying what came before.
Back with one click
Has an error crept in, or was the old version better after all? You view earlier versions and restore them with one click. No searching through emails for “the last good version”.
Traceable within the team
Who changed what and when stays documented. That helps especially when several people maintain content — misunderstandings resolve themselves instead of ending in blame.