Description: This material is from Chapter 23: Servlets from the book JBuilder Developer\'s Guide.Entities have a singular purpose: to represent an entity of data from a given data source. This typically represents a record within a database. The beauty of this component is the capability to manipulate the data stored within a data store through a standard interface instead of having to send manipulation calls directly to the data source in any manner. This technique of wrapping manipulation to a data source is not new; you might know it as object to relational mapping.