In Statistics, event are classified as Independent Events and Dependent Events.
Independent Events: Two events A and B are said to be independent, if the occurrence of one does not affect the occurrence of the other.
For example, in tossing two coins, the occurrence of a head on one coin does not affect in any way the occurrence of a head or tail on the other coin.
Dependent Events: Two events A and B are said to be dependent, if the occurrence of one event affects the occurrence of the other event.
For example, two drawing of a ball from a bag are dependent if the ball is not returned to the bag after the first draw.