This article examines the security challenges associated with containerized applications in Kubernetes environments. It explores the evolution from traditional security models to container-specific approaches needed for ephemeral, distributed workloads. The methodology evaluates security solutions across vulnerability management, compliance monitoring, runtime protection, network security, and access control dimensions. The discussion highlights key challenges including container image vulnerabilities, runtime security enforcement in dynamic environments, multi-tenancy concerns, network segmentation complexities, tooling limitations at scale, and compliance issues in regulated industries. Results demonstrate the effectiveness of comprehensive security controls spanning the container lifecycle, from image scanning and registry controls to runtime protection, network policies, role-based access control, and compliance automation. The article concludes by examining future directions, including zero-trust security models, AI-powered anomaly detection, DevSecOps integration, emerging supply chain security standards, serverless security evolution, and research opportunities in container isolation technologies.