This is a common engineering term which means "The first example".
A prototype is not the finished thing, but it has all the most important features of the final product.
This means a physical object that represents the final item. For example a 'prototype' of a new car, or a prototype of a new printer.
This is a piece of code that represents the final code but is not complete in all its detail. Engineers use a software prototype to decide if they are going in the right direction with the final code.
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Click on this link: Prototype