Abstractly, the BMS group is an infinite-dimensional extension, or a superset, of the Poincaré group, in which four of the ten conserved quantities or charges of the Poincaré group (namely, the total energy and momentum associated with spacetime translations) are extended to include an infinite number of conserved supermomentum charges associated with spacetime supertranslations, while the six conserved Lorentz charges remain unchanged. The BMS group also has a similar structure as the Poincaré group: just as the Poincaré group is a semidirect product between the Lorentz group and the four-dimensional Abelian group of spacetime translations, the BMS group is a semidirect product of the Lorentz group with an infinite-dimensional Abelian group of spacetime supertranslations. The translation group is a normal subgroup of the supertranslation group.