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Token: A token is a piece of data that represents the authorization granted to a user. In OAuth 2.0, tokens are used to access protected resources on behalf of the user. There are different types of tokens, including access tokens and refresh tokens.

Access Token: An access token is a credential that represents the authorization granted to access a protected resource. It is typically included in HTTP requests to authenticate the user. Access tokens have a limited lifespan and are used to access resources on behalf of the user without revealing the user's credentials.

Refresh Token: A refresh token is a credential used to obtain a new access token when the current access token expires. Refresh tokens are typically long-lived and are used to maintain the user's session without requiring them to re-authenticate every time the access token expires.

Resource Owner: The resource owner is the entity that owns the protected resource and grants access to that resource. In OAuth 2.0, the resource owner is typically the end-user who authorizes an application to access their protected resources.