What type of data related to the customer is stored in cookies in Magento?

In Magento, cookies are primarily used to enhance the user experience by storing session-specific data. One of the critical pieces of information saved in cookies is the items in a customer's shopping cart. This enables the platform to remember what a customer has added to their cart across different sessions, allowing for a seamless shopping experience. When a customer returns to the site, the cookies help retrieve the cart data, so customers do not lose their selections.

The other options, like user's age, payment history, and customer service interactions, typically require more sensitive handling and are not stored in cookies for privacy and security reasons. Instead, that information is generally stored in secure databases, with appropriate measures in place to protect sensitive customer data. This distinction reinforces the role of cookies in providing functional and temporary session data rather than sensitive personal information.