Prospective Memory is when you remember to perform an action at the appropriate time that you previously intended to accomplish. 'Remembering to remember' is another way to describe this type of memory. Prospective memory is used a great deal in our day to day lives.
Examples are remembering to take medicine at a certain time, remembering to set your alarm for an important meeting, or stopping to get milk after work because you noticed you were out that morning. Another example is when a pilot encounters an emergency situation and has to recall the emergency procedures they learned in training.