P2 Server fetches data from external systems and, depending on the adaptor being used, the data is returned in one of two formats: time series or tabular.
Time series: A sequence of named data points which typically contains consecutive measurements over a period of time.
Tabular: Contains data points that can be represented using rows and columns.
When you are defining an attribute, one of the things you need to define is the format of the data returned by an attribute.
P2 Server uses this information in a number of different areas, to work out what operations it can do on the data being returned.