Would you like to be able to move, share or publish your software without worrying whether it will work properly on other computers? Containerization is an OS-level virtualization method used to deploy and run distributed applications without launching an entire virtual machine for each app. Containers are "stand-alone", enabling workflows to be easily packaged and shared across platforms, enhancing reproducibility and portability. This hands-on tutorial by CU Research Computing staff will provide an introduction to containers and the basics of building and running containers with Docker (Part 1 of the workshop) and Singularity (Part 2 of the workshop). Singularity is containerization software used on high-performance computing platforms where users do not have escalated privileges. Users may take either or both parts of the workshop depending on whether their interest is Docker, Singularity, or both.