EAI, or Enterprise Application Integration, is the process of connecting different systems and applications in a company to ensure seamless communication and data flow. Synonyms for EAI include Enterprise Service Bus (ESB), Middleware, and Application Integration. ESB refers to a software architecture used to implement communication between different enterprise applications. Middleware refers to software that facilitates communication between different software applications. Application Integration is the process of connecting different applications within a company to ensure they work together seamlessly. Regardless of the terminology used, all these synonyms refer to the same process- the integration of different systems and applications to enable efficient communication and data exchange within an organization.