A Class 3 DSC is indispensable for tendering or procurement documents, where the submission of offer or application needs to be digitally signed with legal validity as it guarantees the highest level of assurance and security.
Digital Signature for Tender is recognized on almost all the government and PSU respective websites like Gem, IREPS, CPWD, Oil India, ONGC, NTPC etc. anywhere where you do procurement by your state or central e-procurement venture.