Quantum-classical orchestration is the software and control layer that fuses classical computing, the CPUs, GPUs and supercomputers we already run, with quantum processing units inside a single workflow. It matters because a quantum computer on its own does almost nothing useful, since the classical machine prepares the problem, suppresses errors, decodes the results and decides what to send back. This guide is a plain-English explainer of how quantum-classical orchestration actually works, why every real workload is hybrid rather than pure quantum, and what the software stack looks like from the control electronics up to the cloud. A scannable list of the companies building this layer sits near the end, but the heart of the article is the concept itself. 1. The QPU is never alone. Every practical quantum workload is a hybrid one, with classical compute handling preparation, error suppression, decoding and post-processing around a short burst of quantum execution. 2. The loop is the unit of work. Quantum-classical orchestration is built around a repeating loop in which a classical computer sends a circuit, reads the result and decides what to run next, rather than a single one-shot computation. 3. Variational algorithms are the canonical pattern. VQE and QAOA put a classical optimizer in charge and use the quantum processor as a fast evaluator, which is why they are the textbook example of orchestration in action. 4. The stack is layered. Control hardware sits at the bottom, then runtime and middleware, then compilers and synthesis, then cloud access, with networked entanglement at the edge, and different companies own different rungs. 5. Latency decides the architecture. Loose coupling tolerates seconds of network delay, while tight coupling for real-time error correction needs a loop measured in microseconds, and that gap shapes every design choice. 6. Error correction is an orchestration problem. Real-time