The mode is a measure of central tendency in statistics that represents the value that appears most frequently in a set of data values). It is a way of expressing important information about a random variable or a population in a single number). The mode is useful when examining categorical data, such as models of cars or flavors of soda, for which a mathematical average median value based on ordering cannot be calculated. Unlike mean and median, the concept of mode also makes sense for "nominal data" (i.e., not consisting of numerical values in the case of mean, or even of ordered values in the case of median) ). The numerical value of the mode is the same as that of the mean and median in a normal distribution, but it may be very different in highly skewed distributions). The mode of a sample is the element that occurs most often in the collection). If all the numbers or values appear with the same frequency, there is no mode. Data sets can have a single mode or multiple modes.