For an overview of how to install and enable Apple Intelligence see Apple's technote #121115 How to get Apple Intelligence.
While artificial intelligence is gaining in popularity at an accelerated rate, some users have found they prefer to turn off Apple's AI, Apple Intelligence, on their iOS and macOS devices.
To see what Apple Intelligence has been doing on your Mac, or to change the reporting interval go to System Settings->Privacy & Security->Apple Intelligence Report.
There are also various other hidden Settings switches that enable Apple Intelligence in Apple apps (in Messages and Screen Time settings, for example).
For more info on setting up Apple Intelligence see our article How to use ChatGPT in Apple Notes for macOS.