In a word, YES. Apple has been working for a year on this update, which includes many small, but significant visual improvements, and a lot of invisible security and stability updates.
What about my favorite (very old) app; will it still work? That depends; this version of iOS is all 64-bit, which means that some very old apps won’t work. Your iPhone or iPad will alert you to which apps those are.
Backup your data
As always, backing up just before doing a big update is really smart, whether that happens in the cloud or via being directly connected to your Mac and iTunes.
You can install the update under Settings:General:Software Update.
You can also watch a 4-minute video all about what’s new here.
Yes, but what if you run into an issue or need some help? That’s why we’re here!