Definition
The shared responsibility model is a cybersecurity framework that defines the security obligations of cloud service providers and their customers. It clarifies who is responsible for securing different aspects of a cloud environment, ensuring no critical security tasks are overlooked. In practice, the cloud provider secures the underlying infrastructure, while the customer secures their data, applications, and access controls within that infrastructure. This model is crucial for effective risk management and compliance, as it prevents security gaps and promotes clear accountability. For instance, a cloud provider like AWS is responsible for the security of the cloud itself, while a customer is responsible for security in the cloud, such as configuring firewalls for their virtual machines. A common misunderstanding is assuming the provider handles all security, neglecting the customer's vital role in protecting their own data and configurations. This concept is fundamental to cloud security certifications like CompTIA Security+ and AWS Certified Solutions Architect.