Stadia was a cloud gaming service developed by Google that allowed players to stream video games directly to various devices without the need for a gaming console or high-end hardware. The service provided access to a library of games that could be played via streaming, with features including online multiplayer, cross-platform gameplay, and the ability to purchase games individually. Stadia offered a subscription model known as Stadia Pro, which included access to a selection of games, discounts on purchases, and the ability to stream in 4K resolution with HDR quality. However, it's important to note that Stadia was discontinued by Google in January 2023.