If you see a message like this on your screen, you’ll know you’ve been infected with ransomware. [photo by Christiaan Colen CC BY-SA 2.0]

ransomware

/ ˈrænsəmwɛə^r / noun

a computer program that installs itself on a computer or smart device, stops it from working correctly, and demands a payment to make it work again:
I had to pay 50 bitcoins to get rid of the ransomware on my phone.

Read all about it: Will smartphones take over the world?

Drones can be controlled remotely using a smartphone.

remotely

/ rᵻˈmotli / adverb

If you operate a device remotely, you operate it from a distance using a remote control, smartphone, etc.:
Drones can be operated remotely using a smartphone.

Read all about it: Will smartphones take over the world?

Retro styling evokes a down-home, nostalgic atmosphere.

retro

/ ˈrɛtro / adjective

Retro styles, ideas, etc. are based on ones from the past:
You may notice a retro theme going on in our new sofa collection.

Read all about it: Stop the world – I want to get off!

Rhotic speakers pronounce the r in car.

rhotic

/ ˈrotɪk / adjective

Rhotic accents or pronunciations are ones in which the sound r is pronounced when it is not followed by a vowel, for example in car and cart:
Rhotic accents include General American and Scottish English.

Another word for rhotic is r-ful:
People from southwest England often have r-ful accents.

The opposite of rhotic is non-rhotic or r-less:
The standard English of England is generally r-less.