The Enterprise Application Integration, abbreviated as EAI, is a middleware-based IT infrastructure for connecting IT systems. The key benefits are great flexibility and easy expansion, which enable integrated and smooth process handling. EAI solutions serve as a data hub with direct access to specific systems. EAI solutions can ensure seamless business processes by handling all communication between separate software solutions, which is especially important in firms that have accumulated a lot of software for warehouse management, payroll accounting, and order processing over the years.