A cloud security broker is a third-party service that acts as an intermediary between an organization and its cloud service providers, with the goal of providing an additional layer of security for cloud-based systems and data. 

A cloud security broker typically offers a range of services, such as: 

• Assessing the security posture of an organization's cloud environment and identifying potential vulnerabilities or areas for improvement. 
• Implementing security controls and monitoring mechanisms to protect cloud-based systems and data. 
• Providing guidance and support to help organizations comply with relevant security standards and regulations. 

• Facilitating communication and collaboration between an organization and its cloud service providers to ensure that security issues are promptly addressed. 

Cloud security brokers can be particularly useful for organizations that lack the resources or expertise to manage the security of their own cloud environments, or that want to augment their existing security capabilities with additional tools and services. By outsourcing some or all of their cloud security responsibilities to a cloud security broker, organizations can gain access to specialized security expertise and technologies that may not be available in-house.