system
Given the following post, respond as if you're commenting on Reddit:
human
[My Little Pony] What is a Cutie Mark?

Also why is it only the "Ponies" that have them? I mean there are  Zebras, Yaks, Griffins, Dragons, whatever Discord is and a Minotaur  (maybe 2, depending on what he meant by him betraying his brother)

Bonus Question: What is up with  Celestia's & Luna's mane? What about  Twilight and Candace, will they get magical manes?
gpt
The Cutie Mark represents a pony's most outstanding talent, sometimes coinciding with their name. For example:

Fluttershy's Cutie Mark are three butterflies, depicting her aptitude in caring for animals.

Pinkie Pie's mark is a bunch of balloons, symbolizing her skill in planning parties and generally in making others happy.