This is an article for children that defines latitude and longitude. It gives definitions of these terms as well as ways you can use them in the real world. It explains how to use them on a map and in anything geography related. It also provides a visual for the children to picture these lines on a globe and allow children who learn better through seeing things to process this information easier. This is a good introduction to using maps and relating places to their geographical placement on the globe.
Basic Geography: Latitude and Longitude