The purpose of containerization in application deployment is to create lightweight, portable environments that package applications together with their dependencies. This allows for consistent deployment across different computing environments, reducing issues related to compatibility. Containers isolate applications from each other and the underlying infrastructure, enhancing security and resource utilization. This technology enables developers to build, test, and deploy applications faster, promoting agile development practices. By streamlining the deployment process and ensuring uniformity, containerization supports efficient scaling and management in dynamic environments.