The median is the middle value of a dataset when it is sorted in ascending order. It is a measure of central tendency, along with the mean and mode. The median is not affected by outliers, which are data points that are very different from the rest of the data.
The mean is the average of the values in a dataset. It is calculated by adding all of the values and then dividing by the number of values. The mean is affected by outliers, so it is not always a good measure of central tendency.
The mode is the most common value in a dataset. It is the value that occurs the most often. The mode is not affected by outliers, but it can be misleading if there are multiple modes.
In conclusion, the median is the middle value of a dataset when it is sorted in ascending order. It is a measure of central tendency that is not affected by outliers.