Conditional Probability

If event B is dependent on event A, then it is the case of conditional probability.
 

One event must occur before another for it to be called conditional probability. For instance, there is a dependence of the automobile industry on the plastics industry. 

So, when the plastics industry increases the prices of plastic, the price of the raw material (plastic) increases for industries like the automobile industry.

Hence, the price of vehicles in the automobile industry also rises. This is known as conditional probability.