Email address. When filling out the credit card application form, you need to provide an email address where you can receive emails. This email address is an email address that you can check frequently to ensure that you can receive important information such as credit card bills in time. When filling out the credit card application form, you need to fill in your email address in the corresponding "email address" column. If you don't have a mailbox, you can choose to use free or paid services according to your personal needs and preferences, such as Gmail, Outlook, QQ mailbox, etc. When choosing a mailbox, you need to pay attention to protecting your privacy. Avoid using names that are too obvious or contain personally identifiable information as e-mail addresses, such as names, addresses, mobile phone numbers, etc. Protecting your private information helps to prevent personal information leakage and network security problems.