A cross-section data shows information about different subjects or elements of a sample or population during the same period of time.
The information below is not based on real statistical data, but it can help us understand what we mean by cross-section data.
In the table below, you can see that the subjects are different since the information was compiled for 5 different companies.
Second, the information was compiled during the same time period. It was during the year of 2001.