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In the broadest sense, a furry is someone with an interest in anthropomorphized animals — that is, animals who have been given human characteristics, like an ability to talk or walk on their hind legs.
I got that from Google lol. If that was confusing, its an animal who walks on two legs. A person can be a furry by a lot of ways, from just being a fan of furries, to being a full-on with a fursuit and everything. A fursona is your personal furry character/OC.
Here is a pic of a very basic fursuit.