glibc is the GNU C Library, which provides many common and important functions for programs. Almost every program in Ubuntu directly or indirectly depends on this, and will completely fail to run without it. Besides the kernel, glibc is probably the most essential part of the system; even the init daemon requires it. In Ubuntu, glibc is provided by the libc6 package.
There is no tag wiki for this tag … yet!
Tag wikis help introduce newcomers to the tag. They contain an overview of the topic defined by the tag, along with guidelines on its usage.
All registered users may propose new tag wikis.
(Note that if you have less than 20000 reputation, your tag wiki will be peer reviewed before it is published.)