Unfortunately, the provided text lacks sufficient information to determine the nature and purpose of Purrbook: Three Little Pigs. While the title and description suggest that it may be an app available on the App Store, the text only contains links to various pages on Apple’s website, such as product pages and special stores.

The specific features, content, or functionalities of Purrbook: Three Little Pigs remain unclear without additional context or information. It is possible that the app is related to the classic story “The Three Little Pigs,” but this is purely speculative and cannot be confirmed based on the available text.

In conclusion, the text does not provide a description or details about Purrbook: Three Little Pigs.