GLib
GLib is a low-level core library that provides data structure handling, portability wrappers, and core application-building blocks for C programs. It is part of the GNOME project and serves as the foundation for many GNOME applications and other software, offering essential utilities like linked lists, hash tables, strings, and event loops. The library is designed to be cross-platform, running on Linux, Windows, macOS, and other Unix-like systems.
Developers should learn GLib when building C applications that require robust, portable, and efficient low-level utilities, especially in the GNOME ecosystem or for cross-platform development. It is essential for creating GNOME desktop applications, as it provides core functionality like memory management, threading, and I/O operations, and is widely used in system tools and embedded software where C is the primary language.