When crawling a target application, Burp Scanner attempts to cover as much of the application's attack surface as possible. Authenticated scanning enables Burp to crawl privileged content that requires a login to access, such as user dashboards and admin panels.
Burp Scanner can authenticate with target applications in two ways:
You can only use one authentication method per scan. If you enter both login credentials and a recorded login sequence, Burp Scanner ignores the provided login credentials.