Apple today released updates for OS X Yosemite and iOS 8.
As usual it is recommended to install these updates as they include a slew of security patches but also bug fixes and enhancements.
Some users may also see a separate security update available (Security Update 2015-004) and/or a Safari update (6.2.5 or 7.1.5).
The list of security patches, fixes and enhancements is long so rather than listing them all, here are some links:
Download size can vary depending on the source. The download site lists file sizes of 1.52GB for the 10.10.3 Update and 2GB for the 10.10.3 Combo Update. OS X Server’s Software Update service lists 2.6GB for the regular update and 2.3GB for the Combo Update. Use the links above to go to Apple’s download page, use Software Update on Mountain Lion and Mavericks or use the App Store’s Updates tab on Yosemite to get these updates and Safari as well.
iOS 8.3 was also released and includes a long long list of fixes and enhancements, info on that can be found here.
As always, back up your Mac and iOS device before installing any updates.