Every time you carry your phone on a walk and later check your step count, that's not magic. It's your phone's sensors quietly doing their job. The same thing happens when you turn your phone sideways to watch a YouTube video, and the screen automatically shifts to landscape. Your device instantly understands that it has been rotated and adjusts itself. All of this is possible because of those tiny sensors built into your Android phone. You can't see them, and you probably never think about them, but they are constantly doing their job for you. These sensors are broadly divided into three categories: motion, position, and environmental sensors. Together, they feed precise information to apps so everything feels smooth and intelligent.
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