Grafana is a popular visualization tool used with ClickHouse to visualize data in real-time effortlessly, thanks to the official OSS ClickHouse plugin. It's particularly useful for Observability use cases and offers features like dedicated views for logs and traces. Users can create dashboards, add visual panels, and specify their data source, including ClickHouse. Visualizations require familiarity with SQL concepts but offer a visual query builder to assist with constructing ClickHouse SQL for most chart types. Examples include bar charts, multi-line charts, heatmap, and candlestick visualizations, showcasing the flexibility of Grafana in handling different datasets and use cases.