Q. What are the different classes of Digital Signature Certificates?

Practically, now a days only two types of DSC is needed in the industry and these are:

Class 2: Commonly used  for Income Tax, MCA filing purposes. Here, the identity of a person is verified against a trusted, pre-verified database. 

Class 3: Commonly used for DGFT, Trademark, E-tendering purpose. This is the highest level where the person needs to present himself or herself in front of a Registration Authority (RA) and prove his/ her identity.