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gRPC allows efficient communication between services using a structured request-response model.

HTTP methods tell the server what to do, and status codes tell us the result.

RPC allows one service to call a function in another service over the network.

Cache breakdowns can overwhelm databases, but request coalescing solves this issue.

gRPC supports four communication patterns: Unary, Server Streaming, Client Streaming, and Bidirectional Streaming.