system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does a console/PC 'read' a game disk so that it loads and produces the game and images on the screen?
gpt
Well the machine does not play the content from the disc. What it does it it reads the disc and puts that information into memory, then it runs from the machines memory. Thats why you might hear the disc start to spin at points when the game is loading new information and it's why games have loading screens. 

As for how the machine takes the info in from the disc it's simple binary. There are pits on the disc, and the machine either reads a pit or no pit. 1 or 0. From there is just a manor of reading and following instructions similar to how you are extracting information from symbols on your screen.