Information in this article applies to Apple Watch Series 5, Series 4, and Series 3.
The Apple Watch comes with a magnetic charging cable that plugs into a power outlet or a USB port. Position the back of the Apple Watch on the supplied charger to charge it, and the charger’s magnets will align the watch with the charger. A green lightning bolt appears on the watch face when it is properly aligned, and charging begins.
There are also third-party chargers available for the Apple Watch. The charger features vary, but the charging process is basically the same.