AWS EventBridge
Managed event bus from AWS — events from AWS services, SaaS partners (Stripe, Datadog, etc.) or your own sources are routed to targets via rules.
Launched 2019 (an extension of CloudWatch Events). Model: event bus → rules (pattern-match JSON) → targets (Lambda, SQS, Step Functions, Kinesis, API Destinations). Schema registry for discovering and type-safe events. Pipes (2023) connect source to target with optional enrichment.
The default glue in event-driven AWS architectures. Competitors: Azure Event Grid, GCP Eventarc, NATS/Kafka for on-prem.