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In this video tutorial, the presenter discusses the use of the arrange function from the dplyr package to reorder rows in a dataframe, specifically using the iris dataset. The tutorial begins with loading the dataset into a variable and the dplyr library. It demonstrates that the sepal length column is not initially in order. By applying the arrange function, the sepal lengths can be reordered from lowest to highest. Additionally, for descending order, the tutorial introduces the desc() helper function, which, when applied to the column, organizes the data from highest to lowest. The presenter also notes that multiple columns can be included in the arrange function for more complex sorting.