This fact is related to: algebraic number theory
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This theorem controls the abstract structure, as well as the concrete context of occurrence, of a group occurring in the following context: elliptic curve group
Actually the result is a bit more general: it says that for any Abelian variety over a number field, the divisor class group is finitely generated. Since we already know it is an Abelian group, this basically, by the structure theorem for Abelian groups, tells us that the divisor class group is the product of a free Abelian group and a finite group (the finite group is called the torsion part).