What is the difference between out standing expense and prepaid expenses?

Outstanding Expenses are expenses which are due at a specific point of time for example if the actual date to pay the rent is 1st july and we don't pay the rent till august end, then it is called the outstanding Expenses (outstanding rent)

prepaid Expenses are expenses which are paid in advance for example if we paid the premium of Insurance in advance i.e before due date, then it calls the prepaid expenses.