A flat representation of the earth's surface or part of it can be termed as a map. Throughout history maps have been used for survey and record territory, plot routes, and reflect our knowledge of the world's geography. Many of the principle's used in modern mapping were laid out by classical Greek geographers. The first map was made in Babylon in about 2500 B.C. Map making was revolutionized in the 15th century the explorers, who increased their knowledge of the size and geography of the globe. Most maps use a similar range of symbols known as conventions, which are instantly recognizable. Maps are of different types to include they are city maps, satellite maps, road maps. The main conventions are colours and symbols. Maps are used for different reasons, and their style varies according to their purpose. Some are used to find routes; others record settlements and land divisions. Satellite maps record landscapes, features of the parts of the earth's surface. Over time, new discoveries in mathematics, astronomy, and space technology have transformed map making.