[pgpool-general: 5832] What are PostgreSQL servers and a PostgreSQL database client?

[Zui che]

In http://pgpool.net/mediawiki/index.php/Main_Page, It says, Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client.

Anybody help me to understand what is PostgreSQL server and what is PostgreSQL database client?

Best regards,
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