A multi-way balanced tree. The "B" in B-tree has never been officially defined. It could stand for "balanced" or "Bayer", after one of the original designers of the algorithms and structure. A B-tree is _not_ (necessarily?) a "binary tree". A B+-tree (as used by IBM' s VSAM) is a B-tree where the leaves are also linked sequentially, thus allowing both fast random access and sequential access to data. [Knuth' s Art of Computer Programming]. [Example algorithm?] (2000-01-10)