Difference between ng-model and data-ng-model

Issue

I am new with the AngularJs. Can anyone say the difference between ng-model and data-ng-model?

With ng-model

First Name  :  <input type="text" ng-model="fname" id="fname">
Second Name :  <input type="text" ng-model="lname" id="lname">  

With data-ng-model

First Name  :  <input type="text" data-ng-model="fname" id="fname">
Second Name :  <input type="text" data-ng-model="lname" id="lname">  

Solution

Best Practice: Prefer using the dash-delimited format (e.g. ng-bind for ngBind). If you want to use an HTML validating tool, you can instead use the data-prefixed version (e.g. data-ng-bind for ngBind). The other forms shown above are accepted for legacy reasons but we advise you to avoid them.

Answered By - sylwester