Focus on the pronunciation of optional
English definition of “optional”
› COMMERCE something that is optional is something that you can buy or do if you want to, but that you do not have to buy or do: Optional plug-ins cost a further $50 on average. optional accessories/components
optional extra › COMMERCE, MARKETING something that can be added, at extra cost, to a basic product or service to make it more attractive, efficient, etc.: Some car manufacturers offer advanced stereo systems as an optional extra on their more expensive models.