Containers (we will define the term in more detailed during the talk) have revolutionized the IT landscape and for a long time Docker seemed to be the default whenever people were talking about containerization technologies (and yes, we will also cover some of the pre-docker container space). But traditional container technologies might not be suitable if strong isolation guarantees are required. So recently new technologies such as gVisor, Kata Containers, or firecracker have been introduced to close the gap between the strong isolation of virtual machines and the small resource footprint of containers. In this talk we will provide an overview of the different containerization technologies, discuss their tradeoffs, and provide guidance for different use cases.