A DSC (digital signature certificate) is a highly secure digital key. Licence Certifying Authority issue this to verify the identity of a person or an organisation. Below are most common uses of digital signature certificates in India:

1. E-Filing of Tax Returns: Digital Signature Certificates is used to e-file income tax returns. Taxpayers who hold a digital signature certificate can sign and submit their returns electronically without the need to physically sign and submit paper returns.

2. ROC Filing: To incorporate a company, Digital Signature Certificate of directors are required. The DSC is used to sign the documents electroniclly that are submitted to the Registrar of Companies for the registration of the company. All the directors should hold a valid digital signature certificate, and same can be used to sign wherever required.

3. E-Tendering: Digital signature certificates is used in the e-tendering process to authenticate the identity of the bidder and to ensure the identity, integrity and authenticity.

4. Signing of Documents in .pdf format: Digital signature certificates is used to sign electronic documents such as contracts, agreements, and other legal documents, ensuring that the signed document cannot be tampered with or altered.

5. Online Banking: Digital signature certificates is used in by banks and financial institutions to ensure the idenditity, security and authenticity of online banking transactions.

Overall, digital signature certificates are an important tool for ensuring the authenticity and security of electronic transactions in India, including e-filing of tax returns, company incorporation, e-tendering, online banking, and signing of electronic documents.