An event is a subset of the set of all possible outcomes of a probabilistic experiment.

The set of all possible outcomes is called sample space and it is usually denoted by . Thus, an event is a subset of , which is indicated by

In simple probabilistic settings, all subsets of the sample space are considered events. However, there are also more complicated settings in which some subsets of the sample space cannot be considered events.

If the probabilistic experiment is the roll of a dice, the set of all possible outcomes isIn this setting, three instances of events areEvent could be described in words as "An odd number appears face up", event could be described as "A number strictly greater than four appears face up", and event could be described as "The number appears face up".

For examples and more detailed explanations of the concept of event, you can go to the lecture entitled Probability.

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