What is a Deliverable?
A deliverable is any unique, verifiable product, result, or capability a project must produce — tangible (a building, a report) or not (a trained team, a certified process). "Verifiable" is the operative word: a deliverable has acceptance criteria someone can check it against.
The exam chain to know: work produces deliverables → quality control verifies them → the customer validates (accepts) them in scope validation → accepted deliverables flow to closing.
Worked example
A water-treatment project's deliverables include the commissioned plant, as-built drawings, operator training records, and the environmental compliance certificate. The plant can be physically perfect — but until the compliance certificate (a deliverable, just paper) is in hand, the project cannot close and the client cannot legally operate.