At Wednesday's Google I/O keynote, the company showed off Android Instant Apps—apps that run without even being installed.

The demo was a sneak peek at a feature that will be rolled out over the next year, according to Ellie Powers, group product manager on the Android team.

With the Web, you can just click on a link and land on a webpage.

She looked for a camera bag on a page of search results, and the resulting link actually loaded a simple app authored by B The app is even already signed in, so that the user doesn t even have to enter a credit card.

Imagine tapping a parking meter and downloading the appropriate app—and being ready to pay, too.

It could take less than a day of work.

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