Data source variables let you change where Grafana looks for data without having to create duplicate dashboards. So for example, if you have multiple different Prometheus databases, you can have one dashboard and use a data source variable to choose which Prometheus that dashboard uses. We'll look at how to set these up in this video. Grafana Cloud is the easiest way to get started with Grafana dashboards, metrics, logs, and traces. Our forever-free tier includes access to 10k metrics, 50GB logs, 50GB traces and more. We also have plans for every use case.