How is pseudo-three-dimensionality realized?

Question

Android

Good afternoon. Interested in the question about the implementation of pseudo 3-D graphics in the game for Android.
What is the essential difference from 2-D, do you need a graphics engine, the presence of sprites for each unit?
The main features of pseudo -three-dimensionality , does the task become more complicated when developing this type of graphics?

Answer 1

https://dev.opera.com/articles/3d-games-with-canva...

Answer 2

The application is not for browsers, but for Android, I'm sorry, I did not specify.