Hunting through avatars and playing around with your newly snagged skin is an easy way to lose track of time and forget why you were initially looking for an Avatar. Authors of these worlds usually either collect game models that they upload and sometimes even program with VrChat exclusive features. In contrast, others make the models entirely from scratch.  So you can consider an Avatar world to be like a gallery. You can wear and favorite these avatars by selecting the picture of the avatar you want and letting it load. However, be aware that some companies and creators charge to be able to download their avatars. So, parents and impulse buyers beware.