Linked from
The 37 pages that link to Power set, each with the reason it gives.
SetBroader topic: It gathers every possible subcollection of a set into one set.
SubsetBroader topic: It gathers every set related to a given set by subsethood.
ElementBroader topic: Its elements are themselves sets built from elements of the original set.
Axiom of Power SetBroader topic: The axiom guarantees this collection is itself a set.