ytDownloader is a cross-platform desktop application built with Electron that provides a graphical interface for downloading videos and audio from YouTube and hundreds of other sites using yt-dlp as the backend download engine. It features a comprehensive download manager supporting single downloads, playlists, and YouTube search, with options for format selection, quality, subtitles, compression, and output templates. The application manages its own yt-dlp and ffmpeg binaries, supports auto-updates, and includes a download history with JSON/CSV export, theming, internationalization (23+ languages), system tray integration, and a global hotkey for quick URL pasting. Architecture: The application follows a standard Electron architecture with a main process (main.js) handling window management, IPC handlers, auto-updater, system tray, and global hotkey. A preload script (preload.js) sets up a context bridge (electronAPI) that exposes filesystem operations, process spawning, clipboard access, and other OS services to the renderer. The renderer process consists of several JavaScript modules (src/index.js, src/playlist.js, src/compressor.js, src/preferences.js, src/history_ui.js, src/common.js) that handle specific views. Communication between renderer and main process occurs via Electron's IPC mechanism (ipcRenderer/ipcMain). User preferences are stored in localStorage and a JSON config file, while download history is persisted as JSON. Key entry points: main.js (Electron main process), preload.js (context bridge), html/index.html (single-page UI shell), src/renderer.js (main renderer logic with YtDownloaderApp class), src/index.js (homepage downloader), src/playlist.js (playlist downloader), src/compressor.js (video compressor), src/preferences.js (settings), src/history_ui.js (history view). External dependencies include yt-dlp (download engine), ffmpeg/ffprobe (media processing), Electron (framework), electron-builder (packaging), electron-updater (auto-updates), systeminformation (GPU detection), and SlimSelect (custom dropdowns). The application bundles these binaries or uses system-installed versions, with fallback mechanisms.