• In software development, a private property of an object which holds a link to another object. That prototype object has a prototype of its own, and so on until an object is reached with null as its prototype. By definition, null has no prototype, and acts as the final link in this prototype chain. ← MDN Web Docs
• In web development and design, an interactive mockup or working model of a website or application used to demonstrate functionality, user flows, and design concepts before full development.
• A JavaScript framework created in 2005 by Sam Stephenson. It provides helpers for DOM manipulation, AJAX (XMLHttpRequest), and other utilities. Prototype is distributed standalone, but also as part of larger projects, such as Ruby on Rails, script.aculo.us, and Rico. Prototype is no longer actively maintained. ← Wikipedia ↑ prototypejs.org

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