If for some reason you don’t feel like installing IOS 16.3 or Ipad OS 16.3 quite yet, you can now choose to download IOS 15.7.3 or Ipad OS 15.7.3 instead.
The focus is on various security fixes, including fixing a number of vulnerabilities that can be exploited by hackers.
If you have an older model of iPhone or iPad that neither supports IOS 15 or 16, you can instead download IOS 12.5.7.
If you want more detailed information about exactly which vulnerabilities have been patched, you can browse further to Apple’s support pages.
As usual, you should make sure to install the updates as soon as possible, this is to be on the safe side.