You can activate Siri with your voice on your iMac and use Siri for many tasks. For example, you can schedule meetings, change settings, get answers, send messages, place calls, and add items to your calendar. Siri can give you directions (“How do I get home from here?”), provide information (“How high is Mount Whitney?”), perform basic tasks (“Create a new grocery list”), and much more.
Siri is available on your iMac whenever you say “Hey Siri” and immediately speak your request, if you enable the “Listen for ‘Hey Siri’” option.
Note: To use Siri, your Mac must be connected to the internet. Siri may not be available in all languages or in all areas, and features may vary by area.
Enable Siri. Open System Settings, click Siri & Spotlight, then set options. If you enabled Siri during setup, press and hold Command-Space bar to open Siri. Or click Siri & Spotlight in System Settings, then turn on Ask Siri. You can also set other options, such as the language and voice to use.