Bundling of Microsoft Windows
The bundling of Microsoft Windows is the installation of Microsoft Windows in computers before their purchase. Microsoft encourages original equipment manufacturers (OEMs) of personal computers to include Windows licenses, OEM software (including bloatware) and OEM drivers with their products, and agreements between Microsoft and OEMs have undergone antitrust scrutiny.
Source: Wikipedia — Bundling of Microsoft Windows (CC BY-SA 4.0)