Visual Studio subscriptions provide access to developer tools, as well as cloud services and software to support all types of dev projects. Microsoft have sold Standard subscriptions through Volume Licensing agreements and annual or monthly Cloud subscriptions through the Visual Studio Marketplace. Note that annual Cloud subscriptions are no longer available, but that existing customers can continue to renew, increase, decrease, or cancel their subscriptions.

The Cloud subscriptions page is here: http://bit.ly/2HrksJj.