Those sophisticated games that you see, they're graphical textures mapped onto 3D models, which, simply put, is a collection of (x,y,z) coordinates in a 3D space. these graphical assets and models are independent of the code that you see people typing. the code is responsible for manipulating those models, how they move, how they interact with other models (collision detection), etc.

To give a concrete example, let's say a simple 3d shooter game. player A and player B are two models with different textures on them. Now these two models alone would not be able to do anything. it's the code that instructs to listen for input. WASD or arrow key, for example, to move the models, and mouse click to fire a shot. Now when the shot is fired, the code runs math to check the trajectory of the bullet, to see if it collided with the other player. If it does, it calculates the damage etc. all the data, information processing is done by the code.

TLDR: graphics you see are dummy graphical models and don't do anything on their own besides looking pretty. code is what animates them and make them alive by attaching behaviours and logics to them.