The complete interview process consists of
an initial technical round followed by a HR round, followed by 2 client technical rounds.
If you clear the initial round, HR may ask you to sign an Indemnity Agreement to proceed further with the interview process with the actual client. This clause may include you to pay 2% of your fixed CTC, if you fail to
1) Join the client after selecting in the subsequent 2 rounds
2) Refuse to attend the scheduled interviews.
Since this interview process requires signing an indemnity clause, I politely declined it.
Requiring to sign an agreement to attend interviews is a huge minus.