Yes, you pretty much got the idea of VMK. It's basically a chat room for ages 8-14, but there is a huge spectrum of older teens and adults (handful of Dis members, too) who play. The characters are guests in The Virtual Magic Kingdom and they can walk around by exploring. You can meet new people, play games to buy items in the shops, trade with other characters all kinds of items, get virtual items for the game by playing real Magic Kingdom Park quests, etc.