API Key authentication type is authenticating users or applications to access an API. An API key is a unique string of characters that is generated by the API provider and assigned to each user or application that needs to access the API. When a user or application makes a request to the API, the API key is included in the request header. The API then validates the API key and grants access to the user or application if the key is valid.

API Key authentication is a popular type of authentication because it is relatively easy to implement and manage. Additionally, API Key authentication can be easily integrated with other security measures, such as OAuth 2.0, to provide additional protection for the API.

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