Significance of Horcruxes

A Horcrux is the product of an evil, unnatural deed, like murder, that results in the soul being split, although no wizard had ever done more than split his soul in half, Dumbledore thinks Voldemort created six Horcruxes (the seventh part of his soul resides in the body he regenerated after returning from exile). The first two are the diary and Marvolo's ring. Both have already been destroyed. Dumbledore thinks the remaining four each have something to do with Hogwart's: Harry won't return to Hogwart's for his seventh year but will instead begin looking for the other Horcruxes.