Leaner Style Sheets, abbreviated as LESS, is a dynamic style sheet language that can be compiled into CSS. In simple words, LESS is a superset of CSS, specifying that all CSS code is valid LESS code, but there are numerous elements in LESS which would not be valid in CSS.
It is a CSS pre-processor which generates simple CSS after compilation.Additional features include variables, functions, mixins and several other techniques that permit you to make CSS more extensible and maintainable.
It is faster and easier.
It allows developers to nest rule sets inside other rule sets.
It permits developers to specify variables in one place.
It allows developers to perform operations on existing values.
It provides developers with the ability to access the value of other properties.
It supports cross-browser compatibility.
It offers various mathematical and operational functions.
It compiles quicker than any other
It offers flexibility to import other LESS files in a LESS file.