Roku offers a range of devices to suit different needs and budgets. The most basic device is the Roku Express, which is a small, affordable streaming device that connects to your TV via HDMI. The Roku Streaming Stick is another popular option, which is a small device that plugs directly into your TV's HDMI port. The Roku Ultra is the most advanced device, offering 4K and HDR support, a voice remote, and other advanced features.