Enterprise Service Bus (ESB)
An Enterprise Service Bus (ESB) is a messaging-oriented middleware architecture that mediates communication between disparate enterprise systems through a centralized routing and transformation layer. Reference implementations include MuleSoft Anypoint Platform, Tibco BusinessWorks, IBM Integration Bus, and Apache ServiceMix. ESBs were the dominant integration pattern through the 2000s and are increasingly reframed as on-premise companions to cloud-native iPaaS platforms.
Why it matters
The ESB is where most PLM-MES-ERP integrations actually live in enterprises that pre-date cloud-native architectures. Its presence or absence is also a useful diagnostic when scoping a digital-thread modernization: an organization with a mature ESB has a transformation layer it can reuse, while one without is usually staring at point-to -point integration debt that has to be paid down before any new system can connect cleanly.
External References
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Cite this definition
Finocchiaro, Michael. “Enterprise Service Bus (ESB).” DemystifyingPLM PLM Glossary, 2026, https://www.demystifyingplm.com/glossary/enterprise-service-bus-esb