Directs who inherits everything not already given away by the specific gifts in the will.
However carefully you list your gifts, some property almost always slips through the cracks: a bank account you forgot, something you bought after signing the will, or a gift that fails because that person died before you. A residuary clause is the safety net that says who gets *all the rest*. Skip it and that leftover property is treated as if you had no will for it, so it passes by the intestacy rules to your legal heirs rather than to whoever you actually wanted, which is one of the most common and costly mistakes in home-made wills.