Using variables. In order not to keep the same data in your head, simply declare a variable and then use it anywhere in the cascading style sheet;
EASY TO USE
You can insert one CSS class into another, which is very convenient and reduces the time spent on writing styles;
A LOT OF TOOLS
Functions and operations. This allows to manipulate variables;
Convenience in working with color;
Can be used on the client-side, for this you need to connect only one js file;
Less is much simpler than other known interpreters.
If you want to "do everything faster, higher, stronger", you should already think about using CSS preprocessors. LESS will be useful for both those who are engaged in the creation of small sites and those who are developing a large server application. This is a CSS interpreter that can be used both on the server-side and on the client-side, as well as from the console.