Microsoft has announced that Spartan will ship with Windows 10 and alongside Internet Explorer. The new browser is designed to compete with other light and fast web browsers such as Apple's Safari and Google's Chrome.
One of the interesting features is Spartan's integration with Cortana, Microsoft's personal assistant. The Cortana icon in the address bar will jump if the assistant has any information on the page you are currently viewing. It's also very easy to look something up with Cortana. Just highlight a word, right click, and select Ask Cortana. This brings up a side panel with whatever information Cortana is able to offer.
Take a look at the video below for a hands-on demo. If you like, you can try out the latest Technical Preview of Windows 10; however, you'll have to wait until the next preview to try Spartan.