HTML5 games are browser-based video games that are built using HTML5, JavaScript, and CSS. They leverage the features of HTML5, such as canvas and WebGL for graphics rendering, audio and video elements for multimedia support, and JavaScript for user interaction. These games can be played directly within a web browser without the need for plugins or software installations, making them accessible and cross-platform. They range from simple puzzles to visually impressive titles, and their popularity has grown due to their ease of distribution and the thriving community of developers. HTML5 games have revolutionized web-based gaming by offering an engaging and interactive experience on various devices.