JWT are also called JSON Web Tokens; they are industry standards for security token used in securely transmitting information between client and server as JSON objects.
They are widely used for being self-contained, small, and complete. Being small in size, they can be sent through URL, POST parameters, or inside HTTP Headers.
JSON Web tokens contain credentials, claims, and other information. To know more about JWT, I recommend reading https://jwt.io/introduction/.
One of the reasons for JWT to be so popular is that, when it is used with web API, the clients consuming them can work with ease, be they mobile app, hybrid app, web app, or any programming language based on Desktop apps or services too.
A sample JWT is an encrypted string containing information for secure communication, as shown in the following screenshot:
The workflow for...