API7.ai’s blog post “10 Most Common Use Cases of an API Gateway” explains how API gateways have become essential in managing modern microservice architectures. Acting as a single, secure “front door” for all client requests, a gateway simplifies routing, strengthens security, and improves scalability and developer efficiency. The article outlines ten core functions: centralized routing; authentication and authorization; rate limiting; response caching; full observability via logging and tracing; request and response transformation; version management; TLS/SSL termination; protocol translation (e.g., REST to gRPC); and data aggregation for front-end efficiency. By consolidating these cross-cutting concerns, gateways reduce code duplication and improve performance, resilience, and compliance

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