A. Groupby and groupby agg are both methods in pandas that allow us to group a DataFrame by one or more columns and perform operations on the resulting groups. However, there are some important differences between the two methods. Groupby returns a GroupBy object, which can be used to perform a variety of operations on the groups. Whereas groupby agg is a method specifically for performing aggregation operations on a grouped DataFrame. It allows us to specify one or more aggregation functions to apply to each group and returns a DataFrame containing the results.