Cumulative frequency is a statistical concept that helps to summarize data by showing the total number of observations that fall below a particular value in a dataset. It is often represented in a cumulative frequency table or graph, where each entry adds the frequency of the current value to the total of the previous values. This allows for a quick understanding of how data accumulates over a range. For example, in a dataset of test scores, the cumulative frequency can show how many students scored below a certain mark. This is useful for identifying trends and making comparisons, such as determining the percentage of students who passed the test. Cumulative frequency is commonly used in various fields, including education and statistics.