The probability is a likelihood of an event happening. For the curious, professional expression that is used for describing a set of events is called an experiment, and each event is called an outcome. The simplest and most classic example of a probability is the flipping coin experiment. We will use it to cover our basic examples on the probability.

A coin has two sides: heads and tails. Whenever you flip a coin, it will essentially land on one of the sides. There's no other possible outcome for this experiment. As we know that the probability of either of the events happening in an experiment is 100% (because, as we said, the coin WILL land on either of the sides), we can say that the probability of the coin playing out heads is 50% and tails is also 50%:

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