How Do Phones Know When You're Walking?

Imagine your phone is like a mini detective. It has tiny helpers inside called sensors that can feel when you're moving, like walking or running. One of these helpers, the accelerometer, senses changes in speed and direction, just like how a toy car knows when it's going up a hill or down a slide. Another helper, the gyroscope, helps your phone know which way it’s facing. When you walk, all these sensors work together to tell your phone that you're moving, so it can do cool things like track your steps or change the screen based on how you hold it.