This new edition has been the occasion to overhaul the presentation in many places, but its main purpose is the update to the new C standard, C23. The goal was to publish this new edition of Modern C at the same time as the new C standard goes through the procedure of ISO publication. The closest approximation of the contents of the new standard in a publicly available document can be found here. New releases of major compilers already implement most of the new features that it brings.