A will states, in detail, how you wish you wish your assets to be allocated after your death. We can also prepare an advance care directive, which gives direction about your health care desires, such as whether you want life support or not.
These give another individual authority to make decisions on your behalf, such as if you become ill and cannot make those decisions for yourself. This is slightly different than stating an enduring guardian, who you give authorisation to make life and medical decisions for you if you are unable.