Scientific Demonstration , a scientific experiment carried out for the purposes of illustrating principles, rather than for hypothesis testing or knowledge gathering
Technology Demo , a prototype version of a technology product, to showcase its forthcoming ideas, performance, method or features; more commonly called a ''demo''
--- Software Prototyping in particular; release of a prototype version of in-progress software
Demoware , software that users can test in a limited fashion before buying
--- Game Demo , more narrowly; a freely-distributed "try-out" version of a video game, usually fully playable but incomplete
