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Authentication / Authorization

What is JWT?
How does traditional authentication login system that uses cookies and sessions to store the user session information?
How does authentication work with JWT (JSON Web Token)?
What does a JWT consist of? What does it look like?
What is in the Header of a JWT?
What is in the Payload of a JWT?
What goes in the Signature of a JWT?
How would a client use a JWT to authorize access to protected routes and resources?
What is OAuth? What is the key benefit of using it?
How does OAuth work?