Friends are the people closest to you, the ones you message, the ones you call, and with Apple Watch they're only one side button press away.
The Apple Watch lets you set up your most frequent and important contacts that way, as "Friends", so you can access them quickly. There's only room for twelve of them, however, one each at all the clock points, so you'll need to choose who makes the cut carefully. You can do that on your iPhone.
Full story from the iMore Blog...