In a business environment, we encounter the concept of inventory daily. Inventory is defined as materials used in business operations, including raw materials, semi- finished products, and finished goods. Inventory management is a crucial logistical task for every company. It is important to maintain a certain level of inventory as a reserve to avoid disruptions in production and delivery. Managers face problems such as unpredictable demand, long delivery times, and unreliable supply processes. Inventory can be classified according to the type of goods and actual or planned quantity. By type of goods, inventory is divided into raw materials and supplies, parts and semi-finished products, and finished products. By planned quantity, inventory is divided into minimum, maximum, optimal, average, safety, speculative, seasonal, excessive, deficient, and obsolete. The paper then presents inventory management methods, which include: ABC analysis, XYZ analysis, and cross ABC and XYZ analysis. Maintaining optimal inventory levels in a company is very important for smooth operations, and the information system plays a key role in this. The practical part of the paper demonstrates the importance of inventory for a company, types of inventory, and ways of maintaining inventory using the example of a fast-food restaurant. The role of the information system in the daily management of inventory levels and their replenishment is highlighted.