A written promissory note of one person to do something or accept to pay a sum of wealth to a specified person, on either a definite date or upon the occurrence, or barring the occurence, of a particular event. A bond, however, in general is a very common form of obligation. An administrator bond or probate bond is required by a probate court so as to protect the administration of a will or estate or guardianship. An administrator is the one appointed by the court to hold the estate of someone who died devoid of a will, with a will but no selected executor, or the perpetrator named in the will has died, removed from the case or does not wish to serve. So if there is a will but no existing executor, the administrator is called an "administrator with will annexed." The method is that if an estate have to be probated (filed and permitted by a court) then somebody (generally a relative or close friend) petition the court in the suitable county (usually where the late lamented last lived) for meeting of a particular person as administrator. This bond is comparatively easy to obtain.