Apple unveiled a wide range of products and updates at its 2013 Worldwide Developers Conference Monday.

Among the highlights were Apple's new operating system OS X Mavericks, iTunes Radio, iCloud Keychain, and the new-and-improved iOS 7, which Apple CEO Tim Cook called "the biggest change to iOS since the beginning of iPhone."

"Can't innovate anymore my a**," added Phil Schiller, senior vice president of worldwide marketing.

Here's what you need to know.

OS X Mavericks

Mac's new operating system has a "deep-tech focus," according to Cook, that includes an extended battery life and features that appeal to "power users." Among those improvements are finder and document tags, and a "supercharged" Mission Control. CPU utilization rapidly compresses inactive memory, thereby freeing up space for more data and cutting battery usage. 

iTunes Radio

The so-called Pandora killer is finally here. Part of iOS 7, which arrives this fall in the U.S., iTunes Radio lets users build stations and skip as they please--a big plus for frustrated Pandora users. The streaming music service can also track what you've played across several devices, and will feature an iTunes buy button. Also notable: It will come pre-loaded with stations and track what's trending on Twitter. 

The service will be free with an iTunes Match subscription. 

iOS 7

Cook said Apple's operating system is used on more 600 million devices. Now it will feature a flatter interface (so long, skeumorphism) and a camera that "is four cameras in one," as Craig Federighi, senior vice president of software engineering, put it. The new operating system also includes upgrades to Safari, a male-voiced Siri, and automatic updates from the App Store (big applause for that one). 

iCloud Keychain

Apple's new iCloud Keychain helps users store passwords and credit card information across various websites and Wi-Fi networks. 

The new feature can also auto-store credit card numbers and expiration dates, except for security codes, which must be re-entered each time they're used.