PlantUML is an open-source tool that allows users to create diagrams from plain text descriptions. It supports various types of diagrams, including UML diagrams, flowcharts, and sequence diagrams, making it useful for software developers and project managers. By using a simple and intuitive syntax, users can quickly generate visual representations of their ideas. One of the key features of PlantUML is its ability to integrate with other tools and platforms, such as Markdown and LaTeX. This flexibility enables users to incorporate diagrams into documentation and presentations easily. Additionally, PlantUML can be run locally or accessed via a web server, providing options for different workflows.