The GNU C Library serves as the C library for the GNU operating system.
To ensure compatibility, the GNU C library offers different compatibility modes that are selectable when compiling an application. This allows for the peaceful coexistence of compatibility support for different varieties of Unix.
But above all, the GNU C library is primarily designed as a portable and high-performance C library. It follows all relevant standards, including ISO C 99, POSIX.1c, POSIX.1j, POSIX.1d, Unix98, and Single Unix Specification.
And last but not least, the GNU C library is internationalized and has one of the most extensive internationalization interfaces known. Overall, the GNU C library is an essential component for any C program that needs to achieve portability, compatibility, and high performance.
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