Mermaid Chart has been the best way to be explicit about things visually: easy to iterate on, flexible, and great for collaboration across teams and tools. The syntax is easy to learn, documentation is great, and AI integration and elements features make approaching their diagrams beginner friendly. I use Mermaid Chart for everything from documenting processes for work, to my family tree, to recipes. Can't recommend highly enough!
An amazingly good and simple product. I use it all the time at work to create Sequence Diagrams to align with customers and internally with the tech team.
It's like writing pseudo code but with the added benefit of it creating visuals for you. Big fan!
I've found Mermaid to be a great tool for putting diagrams into GitHub - it only takes a few minutes to learn the syntax and the docs are really clear.