The SQLSeal Charts plugin extends SQLSeal by enabling data visualization through a variety of chart types. It integrates with ECharts, allowing users to transform SQL query results into line, bar, pie, scatter, and heatmap charts within Obsidian. By leveraging SQLSeal's querying capabilities, users can structure and manipulate data before displaying it graphically. The plugin provides built-in functions to process and refine datasets, making it suitable for users who want to analyze structured information directly in their notes.