Leaving a legally valid will is important for it to be effective. A will documents a person’s intentions for what they want to have happen when they die. To make a legally valid will means complying with all the prescribed legal requirements. Making a valid will according to law is important to its effectiveness. Who else needs to sign a will?
A will documents a person’s intentions for what they want to have happen when they die, see What is a will. It contains their instructions on who is to inherit their property and how, who will administer its disposal and any preferred arrangements for their funeral. If their intentions are to be legally effective, and ultimately put into effect, the will needs to be valid and comply with the legal rules.