Because we need to know exactly which object you want to order and memorize it in the shopping cart.
Cookies are files that memorize the information related to the selected objects directly in the computer of the user. Once the purchase procedure is finalized (or the session ends) the cookies are invalid and can be deleted.
It depends on the software (browser) you are using. Here you have the instructions for the most common browsers:
We don't use third-party cookies.
... and you still want to purchase an object, we suggest you to copy the number and description of the object and send it at novacoins@gmail.com