What does a DAG look like?

You can look at an animation of the DAG visualizer here: https://kgi.kaspad.net/

Also, check out Kaspa Network Visualization and see how the DAG looks at different block speeds: https://macmachi.github.io/kaspa-network-visualizer/

Kaspa Graph Inspector also has a visual animation showing how Kaspa works: http://rustforce1.kaspa.org:8080/