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🔀 '''Enterprise service bus (ESB)''' is a middleware architecture pattern that acts as a central communication backbone, enabling disparate software applications within an organization to exchange data through a standardized messaging infrastructure. In insurance, where core operational systems — [[Definition:Policy administration system (PAS) | policy administration]], [[Definition:Billing | billing]], [[Definition:Claims management system | claims management]], [[Definition:Underwriting | underwriting]] workbenches, [[Definition:Reinsurance | reinsurance]] accounting, and [[Definition:Customer relationship management (CRM) | CRM]] platforms — were often procured or built independently over decades, an ESB provides the connective tissue that allows these systems to communicate without requiring point-to-point custom integrations between every pair of applications.

⚙️ Rather than each system needing to understand the data formats and protocols of every other system it must talk to, an ESB receives messages from a source system, transforms the data into a common canonical format (often aligned with [[Definition:ACORD | ACORD]] standards in insurance), routes it according to business rules, and delivers it to the appropriate destination. When a [[Definition:Broker | broker]] submits a new business submission through a portal, for example, the ESB might route the structured data to the underwriting workbench, trigger a credit check with an external provider, and simultaneously create a prospect record in the CRM — all from a single inbound message. Large carriers and [[Definition:Lloyd's of London | Lloyd's]] market participants historically invested heavily in ESB platforms from vendors such as IBM, TIBCO, and Oracle to manage the complexity of their integration landscapes, particularly during periods of merger-driven system consolidation.

🔄 The ESB pattern, while powerful, has increasingly been supplemented or replaced by lighter-weight [[Definition:Application programming interface (API) | API]]-led and [[Definition:Microservices | microservices]]-based integration approaches as the insurance industry's technology strategy has evolved. Modern [[Definition:Insurtech | insurtech]] firms tend to favor API gateways and event-driven architectures over monolithic ESB deployments, which can become bottlenecks and single points of failure if not carefully managed. However, many established [[Definition:Insurance carrier | carriers]] continue to operate ESB infrastructure as a critical layer within hybrid architectures, especially where legacy [[Definition:Core system | core systems]] lack native API capabilities. Understanding the ESB's role remains important for anyone involved in insurance [[Definition:Digital transformation | digital transformation]] initiatives, because migration strategies, [[Definition:System integration | integration]] roadmaps, and total cost of ownership calculations often hinge on decisions about whether to modernize, extend, or retire existing ESB investments.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Application programming interface (API)]]
* [[Definition:Microservices]]
* [[Definition:System integration]]
* [[Definition:Policy administration system (PAS)]]
* [[Definition:ACORD]]
* [[Definition:Digital transformation]]
{{Div col end}}

Definition:Enterprise service bus (ESB) - Revision history

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