When you freeze regular yogurt, the water molecules inside the yogurt turn into ice crystals, which can affect the texture and consistency of the yogurt. But, don't worry, it's not all bad news! The good news is that the probiotic bacteria in the yogurt can still survive the freezing process, so you'll still get some of the health benefits.
Imagine your yogurt as a tiny city, with the probiotic bacteria as the citizens, and the ice crystals as the skyscrapers. When you freeze the yogurt, the citizens (bacteria) might get a little stressed out, but they can still thrive and do their job. The skyscrapers (ice crystals), on the other hand, can make the city (yogurt) look a bit different, but it's still a cool place to be!