What is a smart card primarily used for?

A smart card is primarily used for storing digital certificates and authenticating users. This small, portable card contains embedded integrated circuits that can securely store data and interact with card readers. The main purpose of a smart card is to enhance security through robust authentication methods.

In many applications, smart cards are employed to grant users access to systems and facilities by verifying identities through the digital certificates they contain. This process makes them suitable for tasks requiring a high level of security, such as accessing sensitive information, securing financial transactions, or managing personal data. Their ability to securely store and manage these credentials makes them a common choice for identity verification in both physical and digital environments.

Other options, while they present various uses, do not reflect the primary and most recognized function of smart cards in cybersecurity and user authentication contexts.