In data representation, what is a histogram primarily used for?

A histogram is primarily used for displaying data distributions. This type of chart organizes data points into specific intervals or "bins," allowing for a visual representation of the frequency of data points within those intervals. By doing so, it provides insights into the shape and spread of the data distribution, allowing for the identification of patterns such as normal distributions, skewness, and the presence of outliers.

In contrast to the other options, a histogram does not specifically show percentages, compare distinct categories, or illustrate trends over time. Instead, its primary focus is on the overall distribution of continuous numerical data, making it a valuable tool for analyzing and interpreting data sets in various fields, including education, psychology, and economics.