Steam is an application for Linux
Playing on Linux distributions is now very simple thanks to Steam, Valve's game distribution platform.
Steam for Linux is an official installer application that can be used to install Valve's Steam software on Ubuntu / Debian based Linux distributions.
Please be aware that this is the installer only, distributed as a DEB file for GNU/Linux operating systems based on Debian and Ubuntu.
It supports 32-bit and 64-bit instruction set architectures.