A geographic information system (GIS) is a computer based system for capturing, storing, checking, and displaying data related to positions on Earth surface. GIS can show many different kinds of data on one map. This enables people to more easily see, analyze, and understand patterns and relationships. With GIS technology, people can compare the locations of different things in order to discover how they relate to each other. For example, using GIS, you can easily find the hospitals which are nearest you, gas stations, and other information useful for you. GIS can use any information that includes locations. The location works on latitude and longitudes. Many different types of information can be compared and contrasted using GIS. The system can include data about people, such as population, income, or education level. It can include information about the land, such as the location of streams, different kinds of vegetation, and different kinds of soil. It can include information about the sites of farms, factories, and schools, or storm drains, roads, and electric power lines. The GIS must manipulate data because the location on map is find out according to the manipulated data.