Domain :
D for Domain, D for Data.
Domain represents the boundaries within which your data lies. e.g. If I had an array of numbers with no number smaller than 1 and no number larger than 100, my domain would be 1 to 100.
Range : You usually make use of a range when you want to transform the value of a raw data point into a corresponding pixel coordinate.
Scale : Now that you know what a domain and range is, you need a way to convert your data into corresponding values in the domain. And thats exactly what scales do.
The most common types of scales are – quantitative scales and ordinal scales.
