Ko is a single binary, command line tool designed for building container images without Dockerfiles, SBOMs, and integrating with Kubernetes. It aims to address common issues in container image construction such as base image selection, layer bloat minimization, and security concerns. Ko simplifies the process of creating container images by providing smart defaults, deterministic specializations, and automatic generation of software bill of materials (SBOMs). The tool also supports custom base images, Go compiler flags, Docker labels, and Kubernetes integration through the `ko apply` command. However, using Ko may pose challenges such as cross-platform concerns, skillset atrophy, and security complacency, highlighting the importance of understanding container technologies and maintaining a secure development lifecycle.