Often we come across concepts that are called the same, have a close interpretation, but a subtle distinction. We will deal with all the definitions of the demo, what it is, what it is for, and where it is used.
Value
In almost all interpretations that this term has, there is a general meaning. It is determined by contraction. It's no secret that the demo is an abbreviated word from a demonstration. Therefore, regardless of all the options that are, the general meaning of the term is understandable. This is a demo, or preliminary, or trial version of something.
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Now this term is called anything. For example, you decide to take an independent exam in computer science. There is a demo version of it on the Internet, where you can practice and understand what issues may arise and what you need to learn. Such demo versions have become very popular on the Internet, because they help to better prepare for the exam and change the "tactics" of preparing for it.