Linked from
The 8 pages that link to B-tree, each with the reason it gives.
Data structureBroader topic: B-trees reduce disk accesses in database and filesystem indexes.
Binary treeCompared with: B-trees trade binary branching for shallow height in storage systems.
MySQLRelated: InnoDB indexes commonly use B-tree structures to speed up searches and sorting.
HFS PlusNarrower topic: HFS Plus uses B-trees to index catalogs, extents, and attributes.