What's the difference between gift cards and discounts?

Hey friends, here is something about gift cards and discounts. To help save your money.
🎁Gift card
How to get: You will receive a formal email after you purchase the gift card from our store. Open the email and get your personal gift card number --16 code.
How to use: Enter your personal gift card number when you checkout.
Where to buy: You can buy gift card from here : PoweraddMall VIP Gift Card.
NOTE:
- The gift card can be superimposed use.
- The subtotal and shipping costs can be deducted from the gift card amount, as long as your gift card amount is sufficient.
Example:

🔖Discount Code
How to get: Our store will offer the discount code irregularly. and also will offer discount code for new products. After you subscribe to our store you can get a discount code once we offer a new one.
Where to get: FB Live, FB live groups, cooperation channels, other discount platforms.
Discount code types:
- Percentage: 10% OFF, 20%OFF......
- Fixed amount: $5 , $10.....
- Free shipping: Free shipping on all products.......
- Buy X get Y: Buy 1, get 1 free.........
How to use: Enter your personal disconut code when you checkout.
NOTE:
- The discount cann't be superimposed use. Limit to one use per customer.
- Limit number of times each code can be used in total: 1 time / code.
- Only the subtotal can be deducted from the discount code, shipping cost cann't be deducted from the discount code.
Example:
