Azure service that provides access to OpenAI's models (the GPT-5 family, embeddings, gpt-image and audio models) with Azure's security, compliance, and private networking. Billed by tokens consumed or by provisioned throughput for predictable workloads.
In AI-901 it's the service that provides access to LLMs within Azure. Question: how do you use GPT models inside the company's security perimeter (VNet, Private Endpoint) instead of OpenAI's public API? Azure OpenAI Service.
Azure OpenAI Service is a concept that can show up on the exam. Check the full guide to see it in context.