Linked from
The 20 pages that link to Symmetric group, each with the reason it gives.
Finite groupBroader topic: It provides a concrete model of finite groups through permutations.
Permutation groupBroader topic: It is the largest permutation group on a given finite set.
Conjugacy classBroader topic: In this group, conjugacy classes are classified by cycle type.
Alternating groupRelated: Aₙ is the index-two subgroup of Sₙ formed by even permutations.