udev is a collection of tools and a daemon to manage events received from the kernel and deal with them in user-space. Primarily this involves creating and removing device nodes in /dev when hardware is discovered or removed from the system. . Events are received via kernel netlink messaged and processed according to rules in /etc/udev/rules.d and /lib/udev/rules.d, altering the name of the device node, creating additional symlinks or calling other tools and programs including those to load kernel modules and initialise the device.