Final answer:
The mode of a data set is the most common value.
Step-by-step explanation:
The mode of a data set is defined as the most common value in the set. It is the value that appears with the highest frequency. In other words, the mode is the number that occurs the most often in the data set.
For example, consider the data set {1, 2, 2, 3, 4, 4, 4}. The mode of this data set is 4 because it appears three times, which is more often than any other number in the set.
The mode is useful in describing the data set, particularly when you want to know the value that occurs most frequently.