Final answer:
In business, information stored under a list of customers usually means a customer database or CRM system, which is vital for personalizing marketing and enhancing customer service.
Step-by-step explanation:
In the context of business, the term for information that's on file under a list of your customers typically refers to a customer database or customer relationship management (CRM) system. This is where businesses store and organize detailed customer information such as contact details, purchase history, and interaction logs. Managing this database effectively allows a company to personalize their marketing and improve customer service, thereby increasing customer loyalty.