Package Management System

출처 : http://en.wikipedia.org/wiki/Package_management_system

A package manager or package management system is a collection of software tools that automates the process of installing, upgrading, configuring, and removing software packages for a computer's operating systemin a consistent manner. It typically maintains a database of software dependencies and version information to prevent software mismatches and missing prerequisites.

Packages are distributions of software, applications and data. Packages also contain metadata, such as the software's name, description of its purpose, version number, vendor, checksum, and a list of dependenciesnecessary for the software to run properly. Upon installation, metadata is stored in a local package database.

Package managers are designed to save organizations time and money through remote administration and software distribution technology that eliminate the need for manual installs and updates. This can be particularly useful for large enterprises whose operating systems are based on Linux and other Unix-like systems, typically consisting of hundreds or even tens of thousands of distinct software packages; in the former case, a package manager is a convenience, in the latter case it becomes essential.^[1]