Answer
Extensions add new features such as PostGIS, pg_stat_statements, and hstore without modifying core PostgreSQL.
Quick Answer
PostgreSQL extensions add functionality without modifying the core. Install: CREATE EXTENSION extension_name. Popular extensions: pg_stat_statements (query statistics), PostGIS (geospatial), pgcrypto (encryption), uuid-ossp (UUID generation), pg_trgm (trigram similarity for LIKE queries), hstore (key-value in a column), timescaledb (time-series). Extensions ship with PostgreSQL or via PGXN.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ