A guide book or travel guide is "a book of information about a place, designed for the use of visitors or tourists". Travel guides can also take the form of travel websites such as the free and open Wikivoyage.
It will usually include full details relating to accommodation, restaurants, transportation, and activities. Maps of varying detail and historical and cultural information are often included. Different kinds of guide books exist, focusing on different aspects of travel, from adventure travel to relaxation, or aimed at travelers with different incomes, or focusing on sexual orientation or types of diet.
A forerunner of the guidebook was the periplus, an itinerary from landmark to landmark of the ports along a coast. A periplus such as the Periplus of the Erythraean Sea was a manuscript document that listed, in order, the ports and coastal landmarks, with approximate intervening distances, that the captain of a vessel could expect to find along a shore. This work was possibly written in the middle of the 1st century CE. It served the same purpose as the later Roman itinerarium of road stops.