Authentication helps identify and verify the identity of users or clients interacting with your API. This is essential for maintaining security and ensuring that only authorized users can access certain resources or perform specific actions. It is a mechanism of associating an incoming request with a set of identifying credentials, such as the user the request came from or the token that it was signed with. The and policies can then use those credentials to determine if the request should be permitted. It also ensures that sensitive data and functionality are protected from unauthorized access. Without proper authentication, anyone could potentially access, modify, or delete data in your API, leading to data breaches or data corruption.