What was a three-dimensional world? What was a two-dimensional world?

The three-dimensional world and the two-dimensional world were concepts that often appeared in fictional works such as anime and games. The three-dimensional world usually referred to the real world, also known as the real world or the simulated world of the real world. In the three-dimensional world, people usually entertained and interacted through various media such as animation, games, and movies. The two-dimensional world referred to the world in the fictional world, also known as the virtual world or virtual simulation world. In the ACG world, people could interact and entertain themselves through various media such as anime, comics, and games. It should be noted that the two-dimensional world and the three-dimensional world were not strictly concepts but fictional worlds in the works. In the two-dimensional world, there might be different settings and rules that did not exist in reality.