A will dictates what should happen to your money, assets and property after you die (collectively termed your estate).
Having a will makes it much easier for your family to sort out your estate once you have passed on; without a will, your estate will be shared out according to the law of intestacy, which may not be in line with your wishes, especially if you have remarried or have members of your family who are estranged (see below “What happens if I die without a will?”)
Writing a will can also help mitigate the amount of Inheritance Tax that may be payable on the value of your estate, and allows you to leave assets to people outside of your immediate family.