The Atlassian Design System is a comprehensive set of design guidelines and principles for Atlassian products such as Jira, Confluence, and Trello. Its main goal is to ensure a seamless and coherent user experience across different products and platforms. Atlassian improves usability and productivity by standardizing design elements, patterns, and interactions in their software ecosystem.

The system allows for flexibility and customization to meet specific product needs while maintaining design principles. Users can find UI patterns, use inclusive language, access design guidelines and Figma libraries, and use Atlassian Design System components, design tokens, and devtools in their environment.