The document discusses different EventBridge patterns for routing events in AWS applications. It describes single and multi-bus patterns that can be used within a single AWS account or across multiple accounts. The centralized single bus pattern provides easy integration but has single points of failure, while the distributed multi bus pattern avoids single points of failure but is more complex to design. The document also shares a client use case that takes a hybrid approach, using multiple buses within a single account for ingress, egress and internal events.