Master Data Management (MDM) is like having a giant address book with all of your important information in one place. Imagine you have a list of all of your friends' names, emails, phone numbers, and addresses. Every time you need to find someone's address, you go to the same address book. MDM is like that; it stores and helps you manage important data like customer information, product names and prices, or employee contact info. It makes it easier to find and use the data and helps make sure that the data is accurate and up-to-date.