Unlike previous versions of OS X where notification center only showed you various system warnings, status updates, and alerts from programs you are running, in Yosemite Apple has added widgets. These can be seen by opening Notification Center and clicking the “Today” tab at the top.
These widgets make Notification Center somewhat of a replacement for Apple’s Dashboard service, bringing tools like calculators, world clocks, and stock tickers. If you find this feature useful, then there are several settings locations you can use to configure them for your needs. Continue reading
Apple’s Notification Center is a central place to get small details about the status of various applications and system services on your Mac, allowing you to see anything from song information when iTunes changes tracks, to notices about software updates being available. In addition, Notification Center supports quickly tweeting and replying to messages, but in Yosemite the service has been revamped to mimic the Notification Center feature in iOS 7, and might even be geared to eventually replace Dashboard. 
