What is Google Polymer?

Google Polymer is an open-source JavaScript library developed by Google for building web applications using Web Components. It enables developers to create custom, reusable HTML elements, making web development more modular and maintainable. Polymer simplifies the process of building complex user interfaces by leveraging modern browser features and encouraging encapsulation of functionality. Although Google has since shifted focus to its successor, LitElement, Polymer is still used in some legacy projects and provides foundational concepts for modern web component development.