People who live stream their video game play, either by hobby or profession, are known as streamers. The practice became popular in the mid-2010s on sites such as Twitch and, later, YouTube. By 2014, Twitch streams had more traffic than HBO’s online service. Professional streamers often combine high-level play and entertaining commentary, and occasionally earn income from advertising, subscriptions, and donations. Amateur streamers spend long hours competing for an audience.