JSON Web Tokens are a secure way of transmitting information between different applications. JWTs can also be signed. Tokens can have a timestamp associated with them, and once the timestamp is expired, you can block the information exchange for the expired token. You can also verify that the content of the token has not been tampered with. For example, using public/private keypairs, you can ensure that the sender is an authorized sender. This provides an additional layer of security for data or information exchange.