Spend Ada just as you would any other currency, by using a Cardano debit card. Once you have applied for and obtained your card, you will be able to send Ada from your Daedalus wallet to load your Cardano debit card. The funds will automatically be converted into the local currency of your choice, for example Yen or Yuan. You can use the debit card to pay merchants as you normally would, whether it be with online retailers or in bricks and mortar stores.
The chip and pin Cardano debit card will be linked to an app, which you can use to keep track of how much Ada is on your card and the transactions that you have made. Full details about how to get your Cardano debit card will be provided here soon.