Some Elements in Game Engine [Part 1]

a) Tools/Data
In Game Development, the required data it's not easy as write a text files.
In Game Development, at least required some tools such as 3d model editor, level editor, and graphics programs. Even if needed, sometimes we need to develop the game engine itself with adding some codes and required feature.

b) System
A System itself is a part of the game engine which have a function for communicate with the hardware inside the machine. If the game engine already well-made then this system is the only part that required to made a huge change if it's implemented with different platforms. Inside the system itself contained some sub-systems which is graphics, input, sound, timer, configuration. the system itself responsible for doing an initialization, updates, and turning of the sub-systems inside of it.