What is Product Scope vs Project Scope?
Product scope is the features and functions of the thing being delivered; project scope is all the work required to deliver it — including work that never appears in the product: planning, testing, training, documentation, decommissioning the old system.
Measured differently, too: product scope against requirements; project scope against the project management plan. Exam scenarios exploit the gap — "the product is finished" does not mean the project is.
Worked example
Product scope for a toll-bridge system: cameras, plate recognition, billing portal. Project scope adds what the driver never sees: data migration from the old tollbooths, operator training, six months of parallel running, and demolition of the booths themselves. Half the budget lives in that invisible half.