Features of Less

Less is clean, compact, more readable code and written in a well organized way.
Less supports cross-browser compatibility.
Less is faster and easier.
Less is written in JavaScript. It compiles faster than other preprocessor of CSS.
Less provides variables which makes its maintenance faster.
Less provides nesting which makes the code short, clean and organized in a specific way
Less facilitates you to define styles which can be reused throughout the code.
Less is an extension of CSS. So it is also called super set of CSS.
Less is capable enough to sort out the problem of code redundancy.
Less provides @import rule so you can easily handle external files. Importing is required because many people split their stylesheet in multiple files, rather than putting it in one file.
Less provides extend method to groups selectors that share the same style-rules. It makes Less clean and more organized.
Less provides merging property. It is the most exciting feature of Less that accepts multiple values like transform, transition, and box-shadow.