Vladimir Simek presented on security and compliance in AWS. He discussed that security is a shared responsibility between AWS and customers. AWS manages security of the cloud through facilities, physical security, network security, and other measures. Customers are responsible for security in the cloud by defining controls for their applications and data. AWS provides tools like CloudTrail for visibility into API usage, AWS Config for auditing resource configurations, and IAM for control over user permissions to help customers meet their security needs.