A game developer designs, tests, and produces video games for computers, consoles, and mobile devices. They conceptualize and create storylines, characters, gameplay, rules, interfaces, and environments. They often work in teams, collaborating with other specialists such as graphic artists, sound engineers, and programmers. They use various programming languages and software to bring their creative ideas to life. Game developers also fix bugs, refine gameplay mechanics, and ensure the game provides a smooth, engaging experience for players. They may also conduct market research to understand player preferences and trends, and use this information to make their games more appealing.