Computer gaming has evolved significantly since the 1960s. Early games included Spacewar from MIT and text-based interactive fiction games in the late 1970s. The arcade boom of the 1980s saw the rise of elaborate hardware in commercial spaces. PC gaming took off in the 1990s as capacities grew and the internet expanded. The 21st century has seen the rise of consoles, mobile gaming, and over 2 billion gamers worldwide, with the market exceeding $43 billion in 2018. Key aspects of modern gaming include diverse genres, themes of narrative vs mechanics and competition vs cooperation, and the role of hardware, software, and community in the gaming experience.