What does it mean when box plots overlap?

The boxes:

They represent the interquartile range, or the middle half of the values in each group. If two boxes do not overlap with one another, say, box A is completely above or below box B, then there is a difference between the two groups. Non-overlapping boxes, groups are different.

What is an overlap in a box and whisker plot?

Overlap is the degree of overlap between the two IQRs Remember that the median is the mid-point of the data and is shown by the line that divides the box into two parts. Half the scores are greater and half are less than this number. Upper quartile is the 75% point and is the line on the. right of the box.