A Cadet's Guide to Sector 001 Earth was a guidebook program that offered vital information on the planet Earth. This guidebook was released through the Starfleet Bureau of Information, and was available in electronic form.
In 2372, Julian Bashir and Miles O'Brien gave Nog a PADD with this program on it as a going-away present before he left for Starfleet Academy. O'Brien described it as a "completely interactive program detailing Earth's customs, culture, history, geography." (DS9: "Little Green Men")