46546fc7_Buttons_on_toolbar__ta_to_produce_a_smooth_curve__
Excel 'line chart'
This is really a bar chart in disguise. The x-axis scale labels the bars rather than being a numerical scale of values as on an x-y plot. It should not be confused with an x-y plot, which is frequently called a line graph if the data points are joined.
Buttons on toolbar
x-y plots are used to plot one varying quantity against another. (Note that data points are joined directly without trying to smooth the data to produce a smooth curve.)