Google Earth is a computer program that renders a 3D representation of Earth based on satellite imagery. The program maps the Earth by the superimposition of images obtained from satellite imagery, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles. Users can explore the globe by entering addresses and coordinates, or by using a keyboard or mouse. The program can also be downloaded on a smartphone or tablet, using a touchscreen or stylus to navigate. Users may use the program to add their own data using Keyhole Markup Language and upload them through various sources, such as forums or blogs. Google Earth is able to show various kinds of images overlaid on the surface of the earth and is also a Web Map Service client.
Google Earth Help – Instructions for using Google Earth.
Best practices on how to design Google Earth tours for education – Google Earth Tours (GETs) are recorded tours around Google Earth. This site provides tip for creating effective tours.