"So there's this thing called Netflix, and it lets you watch TV over the internet. You don't need to pay for cable or futz with an antenna. Want to check it out?"
If you've had this conversation with a friend or family member, the next question might be "How do I get it on my TV?" After you confirm that they have Wi-Fi, you might recommend a device like the: Cheap, simple, and it plugs into their TV's HDMI port.
But what if their TV is so old it doesn't even have an HDMI port? That's when you tell them about the Roku Express Plus.
Almost as cheap and sold exclusively at Walmart, it's just like the Express but includes an analog AV cable complete with red, white and yellow plugs. There's no reason to buy the Plus if the TV you're connecting to has HDMI, but there are plenty of older TVs that don't. This little device is the best way to revive an old TV in the streaming age.