The scale is the relation between distance on the map and the corresponding distance on the ground, e.g. if the distance on the map and grounds of same two points is 1 cm and 1km receptively, the scale of the map will be 1cm to 1km, R.F= (1:1000000). Scale is very important in any map. If you know the scale, you will be able to calculate the distance between any two places on a map.