A Bearer Token is a type of access token used in authentication protocols, particularly in web applications and APIs. It allows users to access resources without needing to provide their credentials repeatedly. The token is typically a long string of characters that is sent in the HTTP headers of requests to verify the user's identity. When a user logs in, the server generates a Bearer Token and sends it back to the client. The client then includes this token in subsequent requests to access protected resources. This method enhances security by minimizing the need to transmit sensitive information like passwords over the network.