Game Engines are systems used to run video games. These systems can be very complex or somewhat simple depending on the game itself. Many Game Engines, depending on what the game is made for, usually use a custom-made system. 

The Game Engine composition usually varies depending on the platform the game is going to be played from.  Sometimes these systems are built entirely by hand in JAVA or another similar programming language. They may also be built on pre-built Game Engines such as Unity or Unreal. There are other Game Engines available, many of which are open-source software. 

With all the different types of systems on the market, the JAVA programming language is usually used for small game production, within these systems. The reason for this is the flexibility of JAVA programming. The language allows the programmer to meet the needs of the video game, regardless of its complexity. JAVA programming is also used because it is a universal language understood by almost all operating systems. The ability to run on more operating systems means the developer’s game can be distributed among more computer-based people. Wide-spread distribution means more money going toward the developer.

There are also many pre-built systems for people to use such as Unity and Unreal UDT. Both have a free version of their software, for the general public, as well as other high-end versions including more features. The high-end version requires a license. These pre-built Game Engines tend to have large programs. These Game Engines have their advantages, by the fact of allowing developers not to worry so much about the Game Engine itself, but to focus on the model and the artwork inside the game. Another advantage is that they have built-in automated scripts. Sometimes these scripts allow for drag-and-drop operations. Without them, the program software would need everything to be built manually. The automated scripts allow the designer to focus more on the game than on the programming. Some of these types of programs also allow for automatic exporting of the game as well as the engine. This feature can be used for multiple operating systems. 

With the processing power of computers, Game Engines and games are becoming more powerful with each generation of hardware and software. This will allow forever-growing generations of video games which we have not seen in the past.