Heard the word cholesterol before? Everybody might have heard about it..but,what does it exactly mean? Cholesterol is both, a good and a bad thing. It is essential substance for the human body but an excess of it can be fatal. Basically,cholesterol is a waxy,fat-like substance in ones cells which helps in the making of hormones, vitamin D and other substances which help us digest food. However, an excess of this cholesterol can make a person sick and could lead a person towards dangerous conditions.