Buttons like this can also apply to the current website being viewed-for example, click the currency converter button to convert all prices on the website you’re viewing. For example, they can extend Google Chrome by adding a new button to the address bar, such as an ever-present currency converter. Instead, they extend the functionality of Google Chrome and the websites being viewed in it. How about extensions? Extensions also provide functionality, but unlike apps, there is little or no UI component.

Google Chrome is just formalizing the web app concept in a way that will be familiar to anyone who’s used apps on a smartphone.

Examples include games, photo editors, and video players all of these categories are viable as tightly focused apps running inside the browser. We’ve already had the concept of “web apps” in the browser for a few years, as something more rich and interactive than a website, but less cumbersome and monolithic than a desktop application. They are just how they sound: applications you can run inside your browser with a dedicated user interface and, typically, rich user interaction. There’s no 'better' approach here apps and extensions are simply different creatures. Apps and Extensions: A Different User Experience

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