Cortana made her first appearance as an assistant in Windows Phone 8.1. With the release of Windows 10, PC and tablet users can now ask her for help.
To get her to answer your questions, simply hold down the Windows key and C, or activate Hey Cortana from the menus.
Here are her responses to some pressing life questions and her role in Halo.
Cortana doesn't like to brag, but if you ask her "Who's your daddy?" she will give you this response.
"Technically speaking, that'd be Bill Gates. No big deal."
While Cortana can easily hide away if you don't need her help, Microsoft's earlier virtual assistant was not so camera shy. Clippit (or Clippy as he affectionately became known) first appeared in Microsoft Office 97.
He wasn't the most popular kid in class, and Cortana has several fun answers to the question, "Do you like Clippy?" or "Where is Clippy?"
This is just one of her responses to the age-old Clippy question.
Cortana is the artificial intelligence character in the Halo video games. If you ask her about Master Chief, she has a few different responses as to his whereabouts.
"Hopefully getting some R&R. He HAS saved the galaxy three or four times. The guy needs a vacation."
On the topic of the next Halo game, however, she's not so forthcoming.
Do you like earworms? Well, Cortana has a doozy for you. Ask her, "What does the fox say" and you'll get her rendition of this Internet sensation.
You can also ask her to "Sing me a song," and she'll bust out any number of catchy tunes like "On Top of Spaghetti."
Cortana has the perfect sassy answer to this question for the lonely (and inquisitive) Windows 10 user.
"I'll work on being more human, you work on being more digital."
Ask Cortana what she thinks of that other virtual assistant from Apple, and you will get several incredibly diplomatic replies.
This one is for the Monty Python fans. An unladen swallow? She's got the answer for you.
"What do you mean? An African or European swallow?"
Well, she says it all really.
Cortana takes Google Now and challenges him, her or it to a duel based on name alone.
As you can see, Cortana has a sense of humor on par with the classic Dad joke. We still love it, though.
"I'm a big fan of any day that ends in y".
Let Cortana solve the age-old dilemma of choosing a side with rock, paper or scissors. She comes up trumps every time.
Those are just a few of Cortana's Easter eggs. Enjoy the hunt as you track them all down.