There are 4 rounds of interview in total. The first round just asks for your self introduction, your other commitments and availability for the job. The second round is checks your knowledge on the company. For me the third and fourth round was combined and in that round they'll ask various questions testing your aptitude and other qualities. And the HR will contact in between each rounds to let you know if you've passed the round or not. If you pass all the rounds the HR will let you know about further steps.