Rivr, a Zurich-based autonomous robotics startup known for its stair-climbing delivery robot, has been acquired by Amazon in a deal that signals the e-commerce giant's interest in doorstep delivery. Terms of the deal weren't disclosed.

AI stocks soared over the past three years as investors bet on the promising technology. But in recent times, various headwinds have halted the momentum.

Amazon has acquired robotics startup Rivr, known for its four-legged delivery robots on wheels, the company confirmed. The company expects to test ways it can use Rivr's robots to help with "doorstep delivery" and to "improve safety outcomes" for delivery drivers.

Amazon (AMZN 1.40%) CEO Andy Jassy expects AWS revenue to exceed previous forecasts.

Amazon has brought Alexa+ to the U.K., the first European country to receive the AI voice assistant. Alexa+ is now available across Great Britain as part of an early access program, with hundreds of thousands of customers expected to get invitations in the weeks ahead, Amazon announced Thursday (March 19).

Top insights from the latest market news from Thursday, March 19, from The Motley Fool analysts on Team Rule Breakers and Team Hidden Gems.

Here are five key things investors need to know to start the trading day.

Wall Street is nervous about these proven winners. That's often a good sign.

Microsoft, Amazon, and Alphabet have leading cloud computing businesses. All three are spending huge amounts to increase their footprint.