The electronic certificate in Spain is used for various purposes related to identification and security of online transactions. Here are some of the main uses:
 1. Identity: An electronic certificate allows users to verify their identity online, which is important for accessing various electronic services.
 2. Signing documents: It can be used to sign electronic documents, which makes them legally significant and confirms authorship.
 3. Filing Tax Returns: Electronic certificates are often required when filing tax returns through online government portals.
 4. Access to administrative services: Citizens can use the certificate to access various administrations and receive services such as social benefits, medical services, etc.
 5. Security: The electronic certificate provides a high level of security when exchanging data and conducting financial transactions.
 Thus, the electronic certificate significantly simplifies the interaction of citizens with government agencies and other organizations in Spain.