A CAPTCHA is the little box at the bottom of the page with four letters in it, to make sure that you aren't a robot. Some people name it, write what it says, and interpret it how ever they want to (ex: yyyy, CAPTCHA loves Ys!, or ddog, CAPTCHA sees a dog!).

An AE (Alter Ego) is like a different person/animal. They have their own imagined personality and appearence. You can write them in different text styles, like bold, italics, in between stars, etc. So, basically you have someone else that you made up writing in your post; but you are writing it.

Ex: AEs are super cool, and you should totally make one!

My AEs and CAPTCHA:

Donut is a 9-year-old AE with a twin CAPTCHA named Pavlavla.

Crysti is a 100-year-old elf (but looks younger) with crystal powers.