Electron.js is a framework for building cross platform desktop applications using web technologies. It combines a **main process** that runs Node.js style backend tasks with one or more **renderer processes** that render the user interface via HTML, CSS, and JavaScript. Developers can leverage **web APIs** and **Node.js integration** to create rich, native-like features while sharing code between desktop apps and web projects. Typical exam domains include architecture overview (main vs renderer), inter process communication (IPC), security considerations, packaging and distribution (electron-builder, electron-packager), and performance tips. Understanding how Chromium is embedded, how to create and manage windows (BrowserWindow), how to use preload scripts safely, and how to enable or restrict **nodeIntegration** and contextIsolation are common topics. The exam also covers debugging tools (Chrome DevTools in the renderer, Node.js inspector in the main process) and how to structure an Electron app for maintainability. The packaging workflow, updating mechanisms, and bundling with tools like **Webpack** or **Parcel** are important. By mastering these areas, developers can deliver robust cross platform experiences, handle platform specifics, and implement features such as menus, trays, notifications, and native OS integrations while preserving the shared web tech stack. Regular practice with MCQs reinforces memory of command line tooling, configuration files, and common pitfalls when combining web content with native capabilities. This preparation supports confidence in exams and productive professional work.