Water and dust IP ratings: What does IP68 actually mean?

In the smartphone market it’s rare to find a top-of-the-line phone that doesn’t have some kind of water and dust resistance. While it used to be a rarity, it’s now become a lot more commonplace. Even folding smartphones – like the newer Galaxy Z Fold 5 and Z Flip 5 with their moving hinges – are water-resistance. In fact, most upcoming smartphones will likely have some form of protection.