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What are PostgreSQL extension modules and how do you install them?
PostgreSQL extensions add additional functionality to the database system. You can install extensions using the `CREATE EXTENSION` command. For example, to install the `pg_trgm` extension for trigram-based text search, use `CREATE EXTENSION pg_trgm;`. Extensions can be managed via the `pg_extension` catalog. Some extensions come with PostgreSQL distributions, while others may need to be downloaded and installed separately.
PostgreSQL extensions add additional functionality to the database system. You can install extensions using the `CREATE EXTENSION` command. For example, to install the `pg_trgm` extension for trigram-based text search, use `CREATE EXTENSION pg_trgm;`. Extensions can be managed via the `pg_extension` catalog. Some extensions come with PostgreSQL distributions, while others may need to be downloaded and installed separately.