An executor is the personal representative of the estate.  They are the person in charge of taking control of your assets, paying debts, and distributing assets to your beneficiaries per the terms and conditions of your will.  You may choose anyone to be the executor of your will, but it is recommended that you choose someone who is both competent and trustworthy.  The person you choose to be executor should be outlined in your will.  Someone you appoint to be the executor of your will has the right to refuse, so it is wise to choose an alternate in the  secondary executor in place just in case.