Define a simple event.

Hint: An event in probability theory is referred to as an experiment or a process. Simple events are those events where there is occurrence of a single event.

Complete step-by-step answer:
If the event E has only one sample point of a sample space, it is called a simple event or an Elementary Event. It is an event that consists of exactly one outcome. The probability of simple events can be calculated as the ratio of number of favourable events and number of events in a sample space. Many times in the real world we can find simple events whose probability can be calculated. Simple events are the events where one experiment happens at a time and it will be having a single outcome. A simple event is an event where all possible outcomes are equally likely to occur. So the probability of simple events will have all possible outcomes equally likely to happen or occur.
We can find simple events in the real world every now and then, and we can calculate their probability also.
Some examples are listed below:
1)Team A is playing a match, then the event of the team winning the match is a simple event.
2)Choose a card from a deck of 52 cards and get a certain card.
3)Getting a random number from a set of whole numbers or natural numbers. To get an even number will be a simple event.

Note: Simple events can be defined as the single outcome of the performed experiment or it is an event which cannot be broken down any more.