Yes, PostgreSQL is free for commercial use. Here's what the PostgreSQL License allows, the one condition it sets, and what it doesn't cover, in plain words.
Is PostgreSQL Free for Commercial Use? The PostgreSQL License Explained
PostgreSQL Tutorial — Part 1: What Is PostgreSQL? Databases, Tables and SQL Explained
What is PostgreSQL? Part 1 of the PostgreSQL Tutorial explains databases, tables, rows, columns, keys and SQL in plain words, and how PostgreSQL works. No installs yet.
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