Purrbook

The text provided does not give enough information to determine what Purrbook: Three Little Pigs is. Although the page title and description suggest it is an app on the App Store, the text only contains links to various pages on Apple's website, such as their online store and product pages for Mac, iPad, iPhone, Apple Watch, and accessories.

It also includes links to specific pages for education, business, veterans and military, government, Apple trade-in, financing, and other special stores.

Without more information or context, it is unclear what features or functionalities Purrbook: Three Little Pigs offers. It could potentially be a book or game app based on the classic story "The Three Little Pigs," but this is purely speculative and cannot be confirmed based on the provided text.

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