Our walls in the United States are usually made of wooden frames with plasterboard nailed to them. The construction is faster and cheaper that way, the cuffs do not go through the elements of the wooden frame, they only go through the plasterboard. The walls are hollow to allow cables and pipes to easily pass through there. Sound travels through hollow walls quite easily.
When I first saw the episode of the television series “Friends”, where Chandler, Monica and Phoebe listen to Ross sneaking through the wall, I was sure it was just for fun, since I knew you couldn't hear it through walls. But after moving to the United States, I realized that you can even eavesdrop on the entire “Game of Thrones” series from your neighboring room. The clarity of the sound is too good, as long as the volume is high enough. If people are drilling walls, they are drilling through drywall, layers of plasterboard that are nailed to a wooden frame and serve to create walls where there are none or there are layers between the outer layers and the inner surface.
You can drill through certain walls if you want, but make sure it's the right wall or you'll break your fist. I live in Egypt and have lived in Dubai before and I always see memes of people drilling holes in their walls or that their walls are so thin that you can hear their neighbors, etc. To be clear, this contrasts with stone walls that are held together with some type of mortar, or brick walls, or even poured concrete walls.
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