An event gateway is a platform that sits at the heart of an event-driven architecture, providing a centralized management system for event ingestion, filtering, transformation, delivery, retries, scaling, security, and operational visibility. It replaces multiple standalone tools with a single all-in-one tool, handling receiving events, delivering events, filtering events, transforming events, retries and rerouting, scaling to meet demand, security and compliance, and operational visibility. Event gateways are suitable for managing inbound webhook infrastructure, outbound webhook infrastructure, asynchronous API gateway, connecting third-party services, and messaging queue for serverless applications, providing a reliable intermediary between systems. They work by ingesting events, filtering and transforming them, and sending them to where they're needed, often without the need for custom development or integration work.