Grafana supports many different storage backends for your time series data (data source). Each data source has a specific Query Editor that is customized for the features and capabilities that the particular data source exposes.
The query language and capabilities of each data source are obviously very different. You can combine data from multiple data sources onto a single Dashboard, but each Panel is tied to a specific data source that belongs to a particular Organization.
In addition to the data sources that you have configured in your Grafana, there are three special data sources available:
- **Grafana -** A built-in data source that generates random walk data. Useful for testing visualizations and running experiments.
- **Mixed -** Select this to query multiple data sources in the same panel. When this data source is selected, Grafana allows you to select a data source for every new query that you add.
