"In the future we have a standardized cable called a Universal Serial Bus, and it's used for connecting to computers for things like information and/or power transfer. They're super versatile, you know those personal computers you saw in the news last year? Well a USB could be added to connect a future computer without a keyboard and mouse to a keyboard and mouse with the same port and never worrying about brand differences or multiple types of wires or any of that, which makes them easily replaceable parts.
They're so common that you find USB ports on devices, walls, and even people's furniture. The reason you might want it in your furniture is to connect your handheld mobile phone which will run off a grid of towers transmitting low energy high frequency radiowaves, but their batteries drain pretty fast during regular use and need to be recharged frequently. People spend a lot of time on their phones in the future."
"So can you like order a pizza from anywhere?"
"Yes but people in the future don't call anymore. They use a tiny screen on the face of the phone to access a digitally transmitted form to fill out that has all the food options, payment info, and recieving address. You can even get financing for it, the payment split up in smaller regular payments automatically transmitted from your bank balance."
"That's rad!"
"It is not. We hate the future."