It’s a fair question, and answer #1 is always the Glossary.
But answer #2 is a variation: it’s the overview of a project.
Sounds like an obscure piece of information: after all, surely the goals for that project, or it’s stakeholders are more interesting. But everyone who looks at the goals or the stakeholders would also benefit from a ‘project summary in one paragraph’. Or in 3 paragraphs. Or in one pretty diagram (not a model diagram – a diagram from the PowerPoint introduction presentation).
It turns out that these simple introductions get read, and re-used, time after time.