The probabilistic classification is a practical way to perform inferences based on data using statistical inferences to find the best class for a given value. Given a probability distribution, we can select the best option with the highest probability. The Bayes Theorem is the basic rule to perform inferences. The theorem allows us to update the likelihood of an event given the new data or observations. In other words, it allows us to update the prior probability P (A) to the posterior probability P (A|B). The prior probability is given by the likelihood before the data is evaluated and the posterior probability is assigned after the data is taken into account. The following expression represents the Bayes Theorem: