Easy have a demo yourself.
In Admin->Wiki enable the page history feature option
Create a wiki page.
Edit it a couple of times adding various details, maybe even removing some details.
Now click the history button.
You can see each of the edits, with various options like rollback, diff, view source, view version etc.
Total revision control all at your fingertips
Ok, so you dont want to edit a page, goto I18nDev, then click the history link and see for yourself.
There is more help on http://doc.tikiwiki.org