What is Citus?
It's an extension to Postgres that distributes data and queries in a cluster of multiple machines. Its query engine parallelizes incoming SQL queries across these servers to enable human real-time (less than a second) responses on large datasets.
Citus is a tool in the Databases category of a tech stack.
Why developers like Citus
Multi-core Parallel Processing
Drop-in PostgreSQL replacement
Distributed with Auto-Sharding