Behind every database is set of data points that you have decided to collect. This points provide not only a way to organize the data you collect but also allow you an easy reference point to segment on.
Fields are data points that you have pro-actively decided to collect within your database.
Fields can be anything from email address to postal code to the last purchase you made. In order to utilize Fields properly in UMPIRE, this requires some pro-active thought.
It is recommended that you Map out each of the data points you will be collect from your customers and then set up each field in your DataMart.
Once you have these fields set up, you are able to not only map incoming data to these fields so that your database stays organized, but you are also able to easily segment your data using these fields AND use the field names in your templates to pull in data.