They all work slightly differently but provide similar features such as searching for packages by name or description, allowing you to see which version is currently installed on your system, installing new packages with their dependencies automatically handled correctly, updating existing ones automatically when newer versions are released in the repository database etc… Other than saving time they also prevent mistakes that could potentially be made while downloading and installing multiple applications manually with no way to guarantee if they will interrelate properly or not. With most major Linux distributions there are several high quality package managers available such as apt-get, yum/dnf (Red Hat Enterprise Linux/CentOS), zypper (openSUSE), pacman (Arch Linux) and emerge (Gentoo). The main advantage of using a package manager is being able to quickly install whatever you need with one command instead of having to manually download each program from websites individually. Most package management systems can install packages from remote repositories, query for installed packages and their versions, search for available package updates, upgrade installed packages, remove obsolete packages or individual files from packages, verify the integrity of an installation or download of a software package through cryptographic checksums (such as MD5), and create bundles (groups) of related packages that can be managed at once. Package managers have different capabilities depending on the operating system used. Package managers help maintain the consistency of installed programs and keep track of dependencies between them. It is typically used on computers running Linux or other Unix-based systems.
A package manager is a software tool that allows users to manage, install, update, and uninstall programs.
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