An Ordinary Power of Attorney is a legal document that allows you to appoint someone to act on your behalf for financial decisions.
You can allow more than one person to be your attorney, but it will only be valid while you have the mental capacity to make your own decisions.
For example, you can set up an Ordinary Power of Attorney when you are unable to make decisions about financial matters such as those regarding your bank accounts or investment, perhaps because you are in the hospital or on holiday. In this case, your attorney will have the power to act on your behalf.
The main difference between an Ordinary Power and Attorney and a Lasting Power of Attorney is that an Ordinary Power and Attorney automatically ends if you lose mental capacity, whereas this is not the case with a Lasting Power of Attorney.