Discount codes are something with the help of which you can purchase any product or service at a cheaper price. These are just the simple codes offered by companies to their customers.
These are not just the codes but the way through which people save a lot of their money while purchasing the products online which they can't save while buying the items from the offline stores.
Each code needs to be used within the time of its validity. If the discount code is used after its expiry date then it would be of no use. So, it is important for you to exactly know the expiry date of the discount code you have.
The discount offered by the online sellers could be of 10%, 30%, etc. You can pick the discount code according to your requirement.