Less (Leaner Style Sheets; sometimes stylized as LESS) is a dynamic pre-processor style sheet language that can be compiled into Cascading Style Sheets (CSS) and run on the client side or server side. the main difference between Less and other CSS precompiles is that Less allows real-time compilation via less.js by the browser. Many developers choose to use 4-space or 2-space indentation. In LESS, each nested statement (e.g., a statement following a '{' brace) should be indented exactly once more than the previous line's indentation.)