The Free On-line Dictionary of Computing (18 March 2015):
C's standard library routine for storage allocation. It
takes the number of bytes required and returns a pointer to a
block of that size. Storage is allocated from a heap which
lies after the end of the program and data areas. Memory
allocated with malloc must be freed explicitly using the
"free" routine before it can be re-used.
gc is a storage allocator with garbage collection that is
intended to be used as a plug-in replacement for malloc.