libpq@17 for Mac

libpq is the official C client interface library provided by PostgreSQL, primarily used to let programs connect to and operate on PostgreSQL databases. It handles the low-level communication work of establishing connections, sending queries, and receiving results, so developers can call it directly from their own C programs to read from and write to the database without having to implement a protocol themselves. It suits developers who need to integrate PostgreSQL into native applications, especially those writing C programs, building database tools, or maintaining low-level data pipelines. For ordinary users who simply use the database day to day, it is not directly oriented toward an operational interface; it is more like a brick that lays the foundation for developers.