Definition:
A cumulative frequency distribution is a graphical representation that shows the total number of observations that fall below a certain value in a dataset. It is used to understand the cumulative frequency or cumulative relative frequency of the data.

Explanation:
The graphical representation of a cumulative frequency distribution is called an Ogive. It is a line graph that represents the cumulative frequency on the y-axis and the corresponding data values on the x-axis. The Ogive is constructed by plotting the cumulative frequency against the upper class boundaries.

Key Points:
- An Ogive is a type of line graph that displays the cumulative frequency distribution.
- It is constructed by plotting the cumulative frequency on the y-axis and the data values on the x-axis.
- The Ogive shows how the cumulative frequency increases as we move along the x-axis.
- The line connecting the plotted points creates a smooth curve or a series of connected straight line segments.
- The Ogive helps in understanding the distribution of data and identifying key points such as quartiles, medians, and percentiles.
- It can be used to estimate the number of observations falling within a particular range or below a certain value.
- The shape of the Ogive can provide insights into the skewness or symmetry of the data.
- The Ogive is particularly useful when dealing with large datasets or when comparing multiple datasets.

Conclusion:
In conclusion, the graphical representation of a cumulative frequency distribution is called an Ogive. It is a line graph that shows the cumulative frequency on the y-axis and the corresponding data values on the x-axis. The Ogive helps in understanding the distribution of data, identifying key points, and estimating the number of observations within a range or below a certain value.