The process when additional
data is written (
burnt) out to optical disc, so they can played everywhere, however, you cannot edit any data inside the disc, let
alone erasing the whole disc (
CD±RW, DVD±RW, DVD±RAM, and BDRE are the exceptions, because DVD±RAM cannot be finalized, while RW-disc and BDRE can be erased, though you cannot edit the data after you finalize it---so you need to erase the whole disc and repeat the burning process if there's any mistakes)
This process also known as "Closing"