You can take ownership of a page, so that only you can change it. All other users will only have read access.
For example, this might be appropriate for pages that contain your personal information, or that contain scripts that you do not want anyone else to modify. Also, it is essential to own a page if you want to upload an attachment that is not considered safe, see attachments.
To enable ownership of a page, first create the page, then email one of the wiki administrators with the page name, and your login name, requesting ownership of the page.