This is a "factual work within a fictional universe" type piece, representing one of the many textbooks issued to Twilight Sparkle's students at the School of Friendship. It covers a host of subjects, such as science and technology, history, fashion, culture, cuisine and etiquette, and is geared both towards native Equestrians - expanding what they already know - and visitors from foreign lands, or could even serve as a useful primer for visitors from across the Multiverse! Written by Twilight with contributions from all her friends, it's sure to be a useful tool for just about anyone in Equestria.