Will
A legal document setting out who inherits an estate when the person who made it dies, who acts as executors, and (where relevant) who looks after dependants.
A Will is the foundation of most estate planning. It names who is to receive your estate, in what shares and under what conditions; it appoints executors to administer your estate after death; and where relevant, it appoints guardians for minor children.
Wills must be signed and witnessed correctly to be valid in England and Wales (under section 9 of the Wills Act 1837). Most invalid Wills fail on technical execution, not content.
A Will can be updated by codicil (a short amending document) or replaced with a new Will when circumstances change. Mirror Wills are two Wills with matching provisions, prepared together for a couple.