ngrok Secure Tunnels provides a simple way to enable remote access to systems with OAuth 2.0 security in seconds. Adding the `--oauth` variable allows users to log in before accessing the tunnel, and various options like `--oauth-allow-domain` and `--oauth-allow-email` can restrict access to specific domains or email addresses. ngrok also offers additional security controls such as webhook validations, basic authentication, IP restrictions, and Mutual TLS to layer security for different use cases.