What’s the similarity and difference between JWT and cookies

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They are both used to maintain some sort of state (e.g., authentication) for http requests (http is stateless)

JWT is a standardized way to format data
cookie is a mechanism defined by RFC, it is a part of http standard (Set-Cookie, Cookie)
cookies can contain more information than just authentication (e.g., analytics)
cookies could just be JWT inside (you can store JWT in cookies)
- cookies are mainly for browsers
- cookies are automatically stored by the browser and included in the future requests
- cookies often references some session data in server side
JWT is more commonly for direct API requests