Median

Median is a number that measures the center of the data. It can be thought of as the middle value, but is not necessarily one of the observed values.

It separates ordered data into halves.

median

The Median is the value of a sample $X$ such that the probability of getting a value less than the median is equal to the prbability of getting a value greater than the median and is equal to 0.5.

50% of the observations are less than the median
50% of the observations are more than the median