Event:
In probability theory, an event is an outcome or defined collection of outcomes of a random experiment. Since the collection of all possible outcomes to a random experiment is called the sample space, another definiton of event is any subset of a sample space. For example, on the roll of a die, getting an even number is an event. This event is a subset containing sample points{2, 4, 6}. The sample space is{1, 2, 3, 4, 5, 6}