A warehouse management system is like a big library for companies. It helps companies keep track of the things they store in their warehouse. The system keeps track of how many items are in each part of the warehouse, where they are, and how long they've been there. It also helps companies keep track of how much they have spent to store the items, how much they should charge customers for the items, and how much money they make when they sell the items. The system makes it easier for companies to manage their warehouses and keep everything organized.