yum

This command is an alias for dnf on modern distros.
For older distros (e.g., CentOS 7), yum is a distinct program from dnf. Some subcommands and options may differ.
View documentation for the original command

$ tldr dnf

yum [options] [command] [package...]

yum (Yellowdog Updater Modified) is the traditional package manager for Red Hat-based Linux distributions. On modern systems (RHEL 8+, Fedora 22+), yum is a symlink to dnf, which provides the same functionality with improved performance.
On older systems like CentOS 7, yum is the native package manager handling package installation, updates, and removal from configured repositories.

On modern systems, yum is an alias for dnf. Behavior may differ slightly between legacy yum and dnf. Use dnf directly on newer systems.

dnf(8), rpm(8)