C4: visualizing software architecture

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The C4 model is:

1. A set of hierarchical abstractions (software systems, containers, components, and code).
2. A set of hierarchical diagrams (system context, containers, components, and code).
3. Notation independent.
4. Tooling independent.

Visualising software architecture with the C4 model - Simon Brown, Agile on the Beach 2019 - YouTube

vs UML

Has UML Died Without Anyone Noticing? | Ernesto Garbarino

cs.dartmouth.edu/~cs50/Reading/97_Things_Every_Programmer_Should_Know.pdf