Are you not sure about the digital signature you need? The Digital signature wizard gives you an advice based on your needs.
I want to digitally sign my e-mail I want to exchange encrypted email messages I want to login safely into webmail or other services I want to sign PDF documents with a legally valid signature I want to send digitally signed invoices, contracts, conditions, forms or reports to multiple recipients. I want to digitally archive signed documents. I want to prevent errors given by browers when distributing software I want to sign my code or application with a timestamp I want to sign Office documents