Repetition of same value many times can be avoided by the use of variables.

The variables can also be used in other places like selector names, property names, URLs and @import statements.

We can define variables with a variable name consisting of a value.

In lazy loading, variables can be used even when they are not.

Default variable has an ability to set a variable only when it is not already set. This feature is not required because variables can be easily overridden by defining them afterwards.