Scoop is a command-line installer for Windows that manages application installation, updates, and dependencies through JSON manifests. It uses a modular PowerShell architecture with core libraries (lib/) handling manifest parsing, dependency resolution, downloading, and installation, while command-specific scripts (libexec/) implement user-facing operations like scoop-install and scoop-update. The system creates shims for PATH isolation, supports automatic updates via checkver/autoupdate, and maintains a SQLite cache for performance. External dependencies include PowerShell, 7zip, aria2, and Git for bucket management.