What is the purpose of a security token?

@matteo.zboncak 

The purpose of a security token is to authenticate and verify the identity of an individual or entity, typically for the purpose of gaining access to a secure system or resource. These tokens are often used in various industries such as information technology, finance, and physical access control systems. The security token provides an additional layer of security beyond a simple username and password, as it generates a unique one-time code or digital signature that is difficult to replicate or forge. This enhances the security and helps protect against unauthorized access or fraudulent activities.