what is apt in arch linux code example

Example: arch apt

+-----------------------+-------------+----------------+-------------------------+----------------+-----------------+
|        Action         |    Arch     | Red Hat/Fedora |      Debian/Ubuntu      | SLES/openSUSE  |     Gentoo      |
+-----------------------+-------------+----------------+-------------------------+----------------+-----------------+
| Install a package(s)  | pacman -S   | dnf install    | apt install             | zypper install | emerge [-a]     |
| Remove a package(s)   | pacman -Rs  | dnf remove     | apt remove              | zypper remove  | emerge -C       |
| Search for package(s) | pacman -Ss  | dnf search     | apt search              | zypper search  | emerge -S       |
| Upgrade Packages      | pacman -Syu | dnf upgrade    | apt update; apt upgrade | zypper update  | emerge -u world |
| ...                                                                                                               |