What are the different classes of Digital Signature Certificates?

There are 3 different classes of Digital Signature Certificate:
1. Class 1 Certificate: Issued to individuals/private subscribers. Used for validation of user’s name and E-mail address form an unambiguous subject within the Certifying Authorities.
2. Class 2 Certificate: Issued for both Business personnel and Private individuals use. Used for ITR/GST/ROC filing, Company/LLP Registration etc.
3. Class 3 Certificate: Issued to individuals as well as organisations. Primarily intended for e-commerce applications, used for E-Tendering, E-Auctions etc.