How does a smartwatch count your steps throughout the day?
user
If you’re asking how you can track your steps when you wear a smartwatch, I can explain that.
assistant
yes please explain how it tracks my steps if it is on my wrist?
user
Sure.

First, your smartwatch needs a pedometer chip.  It reads how many steps you take, and has a motion sensor to track your pace.  The information it collects is transmitted to a server at a set frequency, which can then be used to estimate your distance and/or your steps per day.
assistant
How does a smartwatch count your steps throughout the day?
user
If you’re asking how you can track your steps when you wear a smartwatch, I can explain that.
assistant
yes please explain how it tracks my steps if it is on my wrist?
user
Each of your steps is registered in your smartphone’s fitness apps.
assistant
How does a smartwatch count your steps throughout the day?