A will is a disposition of one's property to take effect at his death. A supplemental addition to the will is called a codicil.
The law permits one to direct how his property shall go upon his death. The direction, itself, if made according to legal requirements is called a will. The law sets out certain formalities and these must be observed.
A will is also called a "testament." The term "codicil" is used to describe an addition to an existing will.
The usual will is in writing signed and witnessed. Oral wills, permitted under rare circumstances, are called nuncupative. A will written and signed by the testator entirely in his own handwriting is called holographic.
The ordinary will is one in printed, typewritten, or handwritten form, and signed and witnessed. In one or two states if a testator writes out the will entirely in his own handwriting and signs it, the will is valid without witnesses. It is then called a holographic will. The law permits one in his last illness and about to die, to dispose of his personal property (not his real estate) by oral statement in the presence of witnesses. Such a will is called nuncupative. Such wills are not looked upon with favor, and are very rare.