Apple today released updates for iOS, OS X Yosemite, and Apple TV, bringing many bug fixes, reliability fixes, and a speed boost for iPhone 4s and iPad 2 users.
To update your Mac, OS X Yosemite is a bit different than previous version. Go to the Apple menu > App Store. Then switch to the Updates tab.
To update your iOS device go to Settings > General > Software Update.
***Update – added information about Apple TV***
To update Apple TV go to Settings > General > Software Updates > Update Software. If your device claims to be updated either it auto-updated already or you have the older Apple TV 2 which only runs up to software version 6.2. Only the Apple TV 3 can run the new Apple TV 7.0.2 release.