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Flatpak is the Linux community's preferred alternative to Snap for universal application packaging. Like Snap, it bundles applications with their dependencies and runs them in a sandbox. Unlike Snap, Flatpak's infrastructure is fully open-source, decentralised, and uses shared runtimes to reduce duplication between applications.
Flathub (flathub.org) is the primary repository, hosting thousands of applications. Flatpak separates applications from runtimes — a GNOME runtime shared by all GNOME-based apps, a KDE runtime for KDE apps — reducing the total disk space compared to fully self-contained packages. Portal APIs allow sandboxed apps to access files, printers, and other system resources with user permission.
Most Linux distributions except Ubuntu include Flatpak support. Install with `flatpak install flathub org.example.App`. Fedora, Linux Mint, and elementary OS ship Flatpak out of the box. For developers, `flatpak-builder` creates packages from manifest files.