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What are Graph Neural Networks (GNNs), and how does message passing work?

GNNs power recommendations, fraud, and molecule modeling by learning over graph structure. The signal is the message-passing mechanism, why k-hop matters, and why you keep them shallow. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

GNNs power recommendations, fraud, and molecule modeling by learning over graph structure. The signal is the message-passing mechanism, why k-hop matters, and why you keep them shallow. Here is the answer.

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