Assuming this person's never heard of it, I'd describe it like so:
"FeralHeart is an open world style 3D chatroom, where you can create canine or feline avatars, with the addition of wings. There are quite a few customization options available, such as presets, markings, maps, objects, items, etc.
In order to see a custom user-created addition, you must download and install it manually from outside of the game, like you would with a modification for a single-player game, or add-ons for other MMORPGs.
FeralHeart includes the typical features you'd expect, such as: being able to write a biography for your character, adding people to your friend list, blocking people, creating or joining one group per character, as well as various actions and emotes.
There's also the standard chat channels: Local, Group, Party, and Private. General is included, but only works in custom maps.
There are no missions, enemies, damage, or any type of action-oriented aspects in FeralHeart, it is created purely for roleplaying."
