There's a quarter sized hole that was cut out on the bottom of a wall in our condo, I assume a cable was run through but what kind of cable?

It’s on the far bottom on the other side of my room, next to the front door. I assume a cable of some sort was run through. The hole was there when we moved in, presumably done by the previous tenants.

If you have one internet connection, why would you need a hole like that to run a cable through? I’m not really tech savvy so sorry if it’s a stupid question.