As many of you might have noticed some green dots like this and this
Well they are reputation of the user here at DT.... This means user is reputed member here at DT,and use has contributed much to our community..
Not everyone has a chance to get that greens,but if you are good to the community members and has helped them you might get them from the members.
If you like (or dislike) what some has posted or answered,you can admire or igonore him by giving reputations point..which can be given by clicking this icon.
If you like his post Tick on "I approve" if you dislike his/her post Tick on "I Disapprove" .But think before you give someone Disapprove.
If you want to disallow people from seeing your reputation, you can disable it in your user control panel.