demo 
/ˈdɛmoʊ/ noun
plural dem·os /ˈdɛmoʊ/ noun [count] 1 : an example of a product that is not yet ready to be sold
▪ She will be showing a demo of the company's new alarm system. ▪ a demo version of the software 2 : an act of showing someone how something is used or done : demonstration
▪ I saw a demo on how to use the computer program. ▪ The salesman gave us a demo of the vacuum cleaner, and it seemed to work very well. 3 : a recording that musicians make in order to show what their music is like
▪ They sent the demo to several record companies. ▪ She cut/made a demo last week. 4 Brit, informal : demonstration 2
▪ an antiwar demo
▪ She will be showing a demo of the company's new alarm system. ▪ a demo version of the software
▪ I saw a demo on how to use the computer program. ▪ The salesman gave us a demo of the vacuum cleaner, and it seemed to work very well.
▪ They sent the demo to several record companies. ▪ She cut/made a demo last week.
▪ an antiwar demo
