Answer: cookies
Step-by-step explanation:
Cookies refers to small files which are sent by websites to the device of the user which are used in monitoring the user and remembering certain information about the user such as login information, phone number, email addresses, etc. Cookies are necessary in enhancing a website user-friendliness.
Following the information given in the question, since the user will like th website to recognize each customer by name every time he or she visits the website and to retrieve all the information about that customer automatically whenever he or she wishes to make a purchase, the cookies will be used.