A histogram is a graphical representation of a frequency distribution using bars of equal width, without spaces between them, where the area of each bar corresponds to the frequency of observations in the corresponding interval of a variable. It shows the distribution of numerical data values by dividing the entire range of values into equal-sized bins and plotting the count or frequency of observations in each bin. To draw a histogram, the x-axis represents ranges of values or categories and the y-axis represents frequencies or counts, with bars drawn for each category whose height is determined by the corresponding frequency.