You can use Digital Signature Certificates for the following:
To send and receive digitally signed and encrypted emails.
To carry out secure web-based transactions, or to identify other participants of web-based transactions.
In e-Tendering, e-Procurement, MCA (for Registrar of Companies e-filing), Income Tax [for e-filing Income Tax Returns] Applications, and also in many other purposes.
For signing documents like MSWord, MSExcel, and PDFs.
Plays a crucial role in creating a paperless office.