Dear Student ,
The four elements of a map are :
1.Data Frame : The data frame is the portion of map that displays the data layers. This is the most important section of the map document.
2.Legend : The legend is most commonly as the key. Without legend, the color scheme on the map would make no sense to the viewer.
3.Title : Title is important as it gives the viewer a dsecription about the subject matter of the map
4.North Arrow : North arrow is for orientation .It allows the viewers to determine the direction of the map as it relates to due north.
Regards.
Regards.