Stack The suite of technologies that an app or website is built with. This includes the app’s choice of frontend tools, backend tools, and database.

In short, the freemium strategy is this: give away the app for free to draw in a massive number of users,[267] find the “power users” who love the app, and charge them — either once or via a recurring subscription — for extra features.

As soon as the hongbao feature launched, the number of WeChat Pay users mushroomed from 30 million to 100 million.[1102]

For example, say Amazon made the “Add to Cart” buttons a bit bigger for half their users and found a 2% increase in sales, with p = 0.15. While the bigger button seems like a great move, there’s a 15% chance that the sales boost was caused by dumb luck, not the button. That 0.15 is greater than 0.05, so Amazon’s testers won’t roll out the bigger

Google’s self-driving car project Waymo has started collaborating with Lyft to create self-driving cars,[926]

Google’s social network Orkut, for instance, was the dominant social media platform in Brazil from 2008[1053] to 2012.[1054]

To convert a domain name to an IP address, your browser uses a Domain Name Service (DNS),[346] which is like a giant address book.

“data APIs,” lets one app ask another app to hand over some interesting information, such as sports scores, recent Tweets, or today’s weather. It’s like calling the front desk at a hotel to learn which museums and restaurants they recommend.

Prime members do a greater proportion of their shopping on Amazon.