"That’s what games are, in the end. Teachers. Fun is just another word for learning." - Raph Koster
Game Development is the art of creating games, both analog (board games, card games) and digital (video games for mobile, tv or other screens). It is a multidisciplinary art form which draws its strengths from art, design and science. What makes games unique compared to other art forms is interactivity; games give players the agency to act as they will when they want to.
The scope of games produced can vary from project to project - some hobby projects can be done by one individual in under an hour while some projects may take hundreds of people five to seven years. But whatever the scale, the process of game development remains the same.
Core ideas, concepts, story, art style, mechanics are ironed out and even prototyped and iterated over in the pre-production phase. In production, art, audio, design, programming and marketing happen simultaneously. The final game is tested for bugs and issues that real users may bump into. A final master emerges out of the production cycle which is released. The post production phase for games usually involves fixing problems that users might encounter and maintenance.