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=head1 DESCRIPTION

The DBI is a database access module for the Perl programming language.  It defines
a set of methods, variables, and conventions that provide a consistent
database interface, independent of the actual database being used.

It is important to remember that the DBI is just an interface.
The DBI is a layer
of "glue" between an application and one or more database I<driver>
modules.  It is the driver modules which do most of the real work. The DBI
provides a standard interface and framework for the drivers to operate
within.


=head2 Architecture of a DBI Application

             |<- Scope of DBI ->|
                  .-.   .--------------.   .-------------.
  .-------.       | |---| XYZ Driver   |---| XYZ Engine  |
  | Perl  |       | |   `--------------'   `-------------'
  | script|  |A|  |D|   .--------------.   .-------------.