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A Linux distribution is a packaged version of the Linux operating system that combines the Linux kernel with other software tools and applications to create a complete, usable system. Different Linux distributions exist because they bundle the kernel with different selections of software, package managers, and configurations to serve various purposes, from personal computers to servers to specialized devices.
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Arch Linux (/ɑːrtʃ/) is an open source, rolling release Linux distribution. Arch Linux is kept up-to-date by regularly updating the individual pieces of software that it comprises. It provides monthly "snapshots" which are used as installation media. Arch Linux is intentionally minimal, and is meant to be configured by the user during installation so they may add only what they require.
Pacman, a package manager written specifically for Arch Linux, is used to install, remove and update software packages. The Arch User Repository (AUR) serves as a community-driven software repository for Arch Linux and provides packages not included in the official repositories and alternative versions of packages; AUR packages can be downloaded and built manually, or installed through an AUR 'helper'.