What is PlantUML?

PlantUML is a text-to-diagram language that allows users to create UML diagrams (and other types of diagrams) from a plain text description. It's commonly used for generating sequence diagrams, use case diagrams, class diagrams, activity diagrams, component diagrams, deployment diagrams, state diagrams, object diagrams, timing diagrams, and network diagrams. The text descriptions are then processed by the PlantUML software to render the corresponding diagrams. PlantUML supports exporting diagrams in various formats like PNG, SVG, and PDF. It's popular for documentation, software design, and communication.