The video is a lesson on creating a line plot, which is a type of graph used to display the frequency of data along a number line. The video explains how to use common denominators to organize a data set in a table and then plot it on a line plot. It goes through examples of creating a line plot for measuring height and for a quiz where students received a certain number of correct answers out of a total number of questions. The video also explains the meaning of numerators and denominators in fractions and how to interpret the frequency of data on a line plot.