An event broker is a middleware software component that facilitates the exchange of event data between different systems, applications, or services within an organization. It acts as an intermediary, receiving, routing, and managing events to ensure they are reliably delivered to the appropriate recipients. Event brokers decouple event producers from consumers, allowing for scalable, real-time communication and integration across diverse platforms. In cybersecurity, event brokers play a crucial role in aggregating and distributing security-related events, such as alerts or logs, enabling faster detection and response to threats. They support various messaging patterns, including publish-subscribe and event streaming, and often provide features like message filtering, persistence, and replay.