AS400 is a computer system with its own operating system designed for small and medium businesses. It is widely used for working with resource-intensive applications such as enterprise resource planning (ERP), banking, or medical information systems. Here are some of the main uses of AS400:

• ERP software system: Most companies use AS400 as an ERP software system. It provides a complete solution for managing business processes, including inventory and order management, accounting, and human resources.

• Database management system: AS400 functions as a database management system. It has a powerful processor and can quickly process large amounts of data. It can be used as a central data repository where data mining can be applied.

• Mission-critical tasks: AS400 architecture is often used for mission-critical tasks, particularly in industries that require extreme reliability, such as banking and healthcare.

• Enterprise group services: AS400 can be used for enterprise group services such as email and project file sharing applications.

AS400 is known for its high security, scalability, and reliability. It is constantly updated and improved, and its capabilities meet the needs of almost all companies of all sizes. Despite being considered outdated by some, AS400 is still widely used and will continue to be in demand in the near future.