Steam

Steam client is a control interface from which you can access all your games and software from one place. This application allows you to install Valve-purchased games or programs on your computer, and is an electronic distribution of licenses with DRM (Digital rights management) support.

A single purchased game can be downloaded via your own account to any computer in the world. The condition is that the user must be logged in under their unique name to only one computer at a time.

The advantage of the application is that it keeps your games up-to-date automatically, plus it installs the most suitable variant of the game maximally compatible for your computer.