The output format of a Flux query with InfluxDB 2.0 is called Annotated CSV, which contains annotations that describe the data layout, including the datatype, default values, group keys, and field keys. Understanding these annotations is crucial to interpreting the Annotated CSV results, particularly when dealing with multiple filters or group keys. The #group annotation indicates whether a column is part of a group key, which can result in multiple tables being generated based on the filter criteria. InfluxDB users can export data as a CSV with the InfluxDB 2.0 UI, create temporary data with the from.csv() function, or write that data to InfluxDB by following from.csv() with to(). Additionally, users can use regular CSV writing methods such as writing CSV from a file with the CLI or using the Telegraf File Input Plugin.