Definitley my smartphone.
It’s a bit crazy to think about how much humanity now depends on smartphones. For directions for example, when I was a kid and my family wanted to go somewhere for a road trip, we would need to either bring a huge map or print out like a 50 page directions list from a directions website (I don’t remember the site name but God Bless that site, it was ahead of it’s time 🤣 ). Now, it takes 2 minutes to put in where you want to go on any GPS/Map app and it tells you how to get there, how much time it will take, and even alternate routes.
It’s wild cause you don’t realize how much technology has advanced over the years until you take a step back and think about how things were when you were younger.