Digital Signature Authority (DSA) is an entity that identifies and verifies the identity of users, allowing them to sign documents electronically with a secure digital signature. DSA services provide authentication solutions in a digital environment, and are used by businesses and governments of all sizes to validate the legitimacy of transactions, documents, and information being shared online. By providing a secure digital signature platform, DSAs help ensure data integrity, protect against fraudulent activities, and enable real-time collaboration and document sharing.