A Power of Attorney is a written document giving someone else authority to take actions or make decisions on your behalf. You choose the person(s) you want to help you. These person(s) are called an Attorney and you can decide what powers the attorney should have. You also choose how you want your incapacity to be decided so that it is clear when you want your Attorney(s) to act for you.
Under a Continuing Power of Attorney you appoint individual(s) who can assist in dealing with your financial affairs if you are incapable of doing so.
Under a Welfare Power of Attorney your Attorney(s) deal with matters relating to your personal welfare, such as decision about care, accommodation and medical treatment. Such decisions would only be made by your Attorney(s) if a doctor certifies you have become unable to give your own instructions.