The programs needed to create and run a PostgreSQL server
PostgreSQL is an advanced Object-Relational database management system (DBMS). The postgresql-server package contains the programs needed to create and run a PostgreSQL server, which will in turn allow you to create and maintain PostgreSQL databases.
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The Perl procedural language for PostgreSQL
The postgresql-plperl package contains the PL/Perl procedural language, which is an extension to the PostgreSQL database server. Install this if you want to write database functions in Perl.