Testamentary succession refers to the process of distributing a deceased person's assets according to their last will and testament. This legal document outlines how the individual wishes their property, finances, and other belongings to be divided among heirs and beneficiaries after their death. In this process, the appointed executor manages the estate, ensuring that debts are settled and assets are distributed as specified in the will. If a valid will exists, it typically takes precedence over state laws regarding inheritance, which may apply in cases of intestacy, where no will is present.