libpqxx™ is a C++ API to PostgreSQL™. It replaces the earlier libpq++™ with a more Standard Template Library (STL)-conformant interface and makes more extensive use of C++ language features such as exceptions, templates, and strings.

Since libpqxx™ builds on top of the C frontend libpq™, you will need a working libpq™ library on your system prior to getting started with libpqxx™. This is similar to the situation with the older libpq++™ interface.