YouTube. Netflix. Uber. Spotify. TikTok. You name it. You sign up and get your own account. Once you set it up however you want, you can access it from any internet-enabled device, including smartphones and smartwatches. If your device breaks, or is lost, or you switch to a new one, you can still access your account, as well as its settings and information, from another device without having to recreate everything from scratch.