Users that are autopatrolled are the same as normal users, except any edit they make is automatically marked as "patrolled". This means that Pikipedia:Patrollers will see that edit marked as patrolled straight away, meaning that this is one edit they don't have to worry about checking. This is given to users who are trustworthy, and whose edits do not need to be looked after.
For a listing of autopatrolled users, see Special:ListUsers/autopatrolled.