Momento Topics is a fully-managed, serverless messaging service designed to facilitate real-time communication between various components, such as backend services and user interfaces, with minimal setup and configuration. Unlike traditional services like Amazon SNS, which offer stateless communication with higher latency, Momento Topics uses a two-tier architecture with a routing layer and a storage layer, leveraging gRPC for bidirectional streaming over HTTP/2. This architecture enables low-latency, highly scalable message distribution, allowing developers to focus on application development rather than infrastructure management. The service supports a dynamic and resilient system by using a rendezvous hash to determine topic locations without requiring developers to manage topic resources. While the subscription model relies on stateful connections, publishing can occur from any environment, providing flexibility in integration. Momento emphasizes an open architecture and welcomes engagement with developers to enhance their experience and application outcomes.