The latest widget functionality built into OS X Yosemite places widgets into the OS X Notification Center. This means you can click on the Notification Center in the upper right hand corner of an OS X screen. From here, you can see a ton of cool stuff. These widgets are parts of fully functional apps easily installed right from the Mac App Store (and via VPP from Bushel if you so choose!).
Learn About 10 Yosemite Widgets That Make Notification Center in OS X Even Cooler Here…