Cardinal Virtues are the fundamental virtues on which the other virtues are based. The term ‘cardinal’ is derived from the word Cardo. ‘Cardo’ means a hinge or a hook which supports the door, and on which the door turns. Cardinal virtues are defined as a group of virtues such that they cannot be derived from one another and all other virtues can be derived from them or shown to be forms of them. And you can join now also upsc prelims crash course 2022